Hard to say. Looks like B4A is misconfigured. Maybe you are using an old core version. Reinstall B4A and make sure that no file is left from the previous installation.
All other projects are working. This project previously worked. I have created a new project and copied all the code to new project but the error is still present.
When I do the search of this word, nothing returns.
I have solved it. I was cleaning project and removed some of the unused modules and now the error is gone. Interesting thing is that the error was not found by the search engine.