Navigator error

Hi, all. I used navigator in my project but got this error:

java.lang.IllegalArgumentException: Trying to navigate to an unknown state ‘’ and an error view provider not present

i looked through the forum about this problem but didn’t get true solve. Please, help me with it.

Note: when i use it i can navigate to the other view but can’t go back by clicking browser BACK button, but error message is always shown in the page.

See answer here: