Probably i did something like that, but it sounds strange. As a matter of fact I didn't paste any code to the "Main" module, in a B4xPages project. I think that it is obvious. Therefore (in theory) I couldn't have modified that java code, which is part of the predefined code that appears when you create such type of project. Moreover I don't know what is its purpose. In few words, I bet that I didn't modify that "p", either manually or with copy/paste. Moreover again, I never work on Main module, as it is clearly stated at its end. The only operation that may be suspected, is that actually I added a java code inside the B4xPages.MainPage (with #If JAVA / #EndIf). Then I took it away, seeing that it was not working (but was compiled). Never touched directly the Main module... Anyway, the problem is solved. Remains the doubt on the origin of the problem. Thanks to all again.