org.vaadin.artur:a-vaadin-helper maven下不了

在MavenRepository报错:
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NoSuchKey
The specified key does not exist.
vaadin-addons/org/vaadin/artur/a-vaadin-helper/1.5.0
EE0D51AD0334B7A4
kecQzD1f5eGWJrkobaYsNUQzb8tFmU9etK2cTJMZUwa5p5VxwMnfMA2/2FYgglujLTQEM3lHG3o=