Vaadin8 not loading widgetset

I'm upgrading a fairly big project to Vaadin 8, and I think I'm really close to it actually working, except every time I run the application, it gives me an error:

Failed to load the widgetset: ./VAADIN/widgetsets/com.vaadin.DefaultWidgetSet/com.vaadin.DefaultWidgetSet.nocache.js?1491596745122

I think there's an error in my POM, but I don't know what it could be.

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.styleconnect</groupId>
    <artifactId>Crescent-CRM-Vaadin-Maven</artifactId>
    <packaging>war</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>Crescent-CRM-Vaadin-Maven</name>

    <prerequisites>
        <maven>3</maven>
    </prerequisites>

    <properties>
        
        <vaadin.version>8.0.5</vaadin.version>
        
        <vaadin.plugin.version>${vaadin.version}</vaadin.plugin.version>
        
        
        <jetty.plugin.version>9.3.9.v20160517</jetty.plugin.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <!-- If there are no local customisations, this can also be "fetch" or "cdn" -->
        <vaadin.widgetset.mode>local</vaadin.widgetset.mode>
    </properties>

    <repositories>
        <repository>
            <id>vaadin-addons</id>
            <url>http://maven.vaadin.com/vaadin-addons</url>
        </repository>
    </repositories>

    <dependencyManagement>
        <dependencies>

            <dependency>
                 <groupId>com.google.apis</groupId>
                <artifactId>google-api-services-oauth2</artifactId>
                 <version>v2-rev124-1.22.0</version>
               </dependency>
               
            <dependency>
                <groupId>com.vaadin</groupId>
                <artifactId>vaadin-bom</artifactId>
                <version>${vaadin.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.0.1</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>com.vaadin</groupId>
            <artifactId>vaadin-compatibility-server</artifactId>
        </dependency>
        <dependency>
            <groupId>com.vaadin</groupId>
            <artifactId>vaadin-push</artifactId>
        </dependency>
        <dependency>
            <groupId>com.vaadin</groupId>
            <artifactId>vaadin-compatibility-client-compiled</artifactId>
        </dependency>
        <dependency>
            <groupId>com.vaadin</groupId>
            <artifactId>vaadin-themes</artifactId>
        </dependency>
        
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.7</version>
        </dependency>
        <dependency>
            <groupId>com.google.api-client</groupId>
            <artifactId>google-api-client-servlet</artifactId>
            <version>1.22.0</version>
        </dependency>
        <dependency>
            <groupId>org.imgscalr</groupId>
            <artifactId>imgscalr-lib</artifactId>
            <version>4.2</version>
        </dependency>
                <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.41</version>
</dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.3.7.RELEASE</version>
        </dependency>
        
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-web</artifactId>
    <version>4.3.7.RELEASE</version>
</dependency>

<!-- https://mvnrepository.com/artifact/org.springframework.security/spring-security-web -->
<dependency>
    <groupId>org.springframework.security</groupId>
    <artifactId>spring-security-web</artifactId>
    <version>4.2.2.RELEASE</version>
</dependency>

        
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.6</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                    
                    <!-- Exclude an unnecessary file generated by the GWT compiler. -->
                    <packagingExcludes>WEB-INF/classes/VAADIN/widgetsets/WEB-INF/**</packagingExcludes>
                </configuration>
            </plugin>
            
            
            <plugin>
                <groupId>com.vaadin</groupId>
                <artifactId>vaadin-maven-plugin</artifactId>
                <version>${vaadin.version}</version>
                <executions>
                    <execution>
                        <goals>
                            
                            <goal>update-theme</goal>
                            <goal>update-widgetset</goal>
                            
                            <goal>compile</goal>
                            
                            
                            <goal>compile-theme</goal>
                            
                        </goals>
                    </execution>
                </executions>
            </plugin>
            
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-clean-plugin</artifactId>
                <version>3.0.0</version>
                <!-- Clean up also any pre-compiled themes -->
                <configuration>
                    <filesets>
                        <fileset>
                            <directory>src/main/webapp/VAADIN/themes</directory>
                            <includes>
                                <include>**/styles.css</include>
                                <include>**/styles.scss.cache</include>
                            </includes>
                        </fileset>
                    </filesets>
                </configuration>
            </plugin>

        </plugins>
    </build>

    <profiles>
        <profile>
            <!-- Vaadin pre-release repositories -->
            <id>vaadin-prerelease</id>
            <activation>
                <activeByDefault>false</activeByDefault>
            </activation>

            <repositories>
                <repository>
                    <id>vaadin-prereleases</id>
                    <url>http://maven.vaadin.com/vaadin-prereleases</url>
                </repository>
                <repository>
                    <id>vaadin-snapshots</id>
                    <url>https://oss.sonatype.org/content/repositories/vaadin-snapshots/</url>
                    <releases>
                        <enabled>false</enabled>
                    </releases>
                    <snapshots>
                        <enabled>true</enabled>
                    </snapshots>
                </repository>
            </repositories>
            <pluginRepositories>
                <pluginRepository>
                    <id>vaadin-prereleases</id>
                    <url>http://maven.vaadin.com/vaadin-prereleases</url>
                </pluginRepository>
                <pluginRepository>
                    <id>vaadin-snapshots</id>
                    <url>https://oss.sonatype.org/content/repositories/vaadin-snapshots/</url>
                    <releases>
                        <enabled>false</enabled>
                    </releases>
                    <snapshots>
                        <enabled>true</enabled>
                    </snapshots>
                </pluginRepository>
            </pluginRepositories>
        </profile>
    </profiles>

</project>

This is the build log.

[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Crescent-CRM-Vaadin-Maven 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-clean-plugin:3.0.0:clean (default-clean) @ Crescent-CRM-Vaadin-Maven ---
[INFO] Deleting /projects/Crescent-CRM-V/Crescent-CRM-Vaadin-Maven/src/main/webapp/VAADIN/themes (includes = [**/styles.css, **/styles.scss.cache], excludes = [])
[INFO]
[INFO] --- vaadin-maven-plugin:8.0.5:update-theme (default) @ Crescent-CRM-Vaadin-Maven ---
[INFO] Updating theme VAADIN/themes/lightTheme
[INFO] Widgetsets found from classpath:
[INFO] Addon styles found from classpath:
[INFO]
[INFO] Search took 16ms
[INFO] Theme "VAADIN/themes/lightTheme" updated
[INFO] Updating theme VAADIN/themes/darkTheme
[INFO] Widgetsets found from classpath:
[INFO] Addon styles found from classpath:
[INFO]
[INFO] Search took 17ms
[INFO] Theme "VAADIN/themes/darkTheme" updated
[INFO]
[INFO] --- vaadin-maven-plugin:8.0.5:update-widgetset (default) @ Crescent-CRM-Vaadin-Maven ---
[WARNING] GWT plugin is configured to detect modules, but none were found.
[INFO] No widgetsets found - generating AppWidgetset if necessary.
[INFO] Updating widgetset AppWidgetset
[INFO] Adding resource directory to command classpath: /projects/Crescent-CRM-V/Crescent-CRM-Vaadin-Maven/src/main/resources
[INFO] Adding resource directory to command classpath: /projects/Crescent-CRM-V/Crescent-CRM-Vaadin-Maven/target/generated-resources/gwt
[INFO] Using com.vaadin:vaadin-client version 8.0.5
[INFO] Using com.vaadin:vaadin-client-compiler version 8.0.5
[INFO] Widgetsets found from classpath:
[INFO] com.vaadin.DefaultWidgetSet in jar:file:/home/user/.m2/repository/com/vaadin/vaadin-client/8.0.5/vaadin-client-8.0.5.jar!/
[INFO] Addon styles found from classpath:
[INFO]
[INFO] Search took 8ms
[INFO]
[INFO] --- vaadin-maven-plugin:8.0.5:compile-theme (default) @ Crescent-CRM-Vaadin-Maven ---
[INFO] Updating theme VAADIN/themes/lightTheme
[INFO] Theme "VAADIN/themes/lightTheme" compiled
[INFO] Updating theme VAADIN/themes/darkTheme
[INFO] Theme "VAADIN/themes/darkTheme" compiled
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ Crescent-CRM-Vaadin-Maven ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 3 resources
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ Crescent-CRM-Vaadin-Maven ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 71 source files to /projects/Crescent-CRM-V/Crescent-CRM-Vaadin-Maven/target/classes
[WARNING] /projects/Crescent-CRM-V/Crescent-CRM-Vaadin-Maven/src/main/java/inventory/InventoryItem.java: Some input files use or override a deprecated API.
[WARNING] /projects/Crescent-CRM-V/Crescent-CRM-Vaadin-Maven/src/main/java/inventory/InventoryItem.java: Recompile with -Xlint:deprecation for details.
[WARNING] /projects/Crescent-CRM-V/Crescent-CRM-Vaadin-Maven/src/main/java/uiElements/TemplateRowUI.java: Some input files use unchecked or unsafe operations.
[WARNING] /projects/Crescent-CRM-V/Crescent-CRM-Vaadin-Maven/src/main/java/uiElements/TemplateRowUI.java: Recompile with -Xlint:unchecked for details.
[INFO]
[INFO] --- vaadin-maven-plugin:8.0.5:compile (default) @ Crescent-CRM-Vaadin-Maven ---
[WARNING] GWT plugin is configured to detect modules, but none were found.
[INFO] Using com.vaadin:vaadin-client version 8.0.5
[INFO] Using com.vaadin:vaadin-client-compiler version 8.0.5
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ Crescent-CRM-Vaadin-Maven ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /projects/Crescent-CRM-V/Crescent-CRM-Vaadin-Maven/src/test/resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ Crescent-CRM-Vaadin-Maven ---
[INFO] No sources to compile
[INFO]
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ Crescent-CRM-Vaadin-Maven ---
[INFO] No tests to run.
[INFO]
[INFO] --- maven-war-plugin:2.6:war (default-war) @ Crescent-CRM-Vaadin-Maven ---
[INFO] Packaging webapp
[INFO] Assembling webapp [Crescent-CRM-Vaadin-Maven] in [/projects/Crescent-CRM-V/Crescent-CRM-Vaadin-Maven/target/Crescent-CRM-Vaadin-Maven-1.0-SNAPSHOT]
[INFO] Processing war project
[INFO] Copying webapp resources [/projects/Crescent-CRM-V/Crescent-CRM-Vaadin-Maven/src/main/webapp]
[INFO] Webapp assembled in [362 msecs]
[INFO] Building war: /projects/Crescent-CRM-V/Crescent-CRM-Vaadin-Maven/target/Crescent-CRM-Vaadin-Maven-1.0-SNAPSHOT.war
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 32.677 s
[INFO] Finished at: 2017-04-07T20:25:19+00:00
[INFO] Final Memory: 30M/441M
[INFO] ------------------------------------------------------------------------

Does anyone have any idea whats going on?