but I could´t identify why it is necesary to include the library WobleMenu as a Class in the project,
If you are referring to this lib ...
Wobble Menu ... Bottom Navigation.
There should be no need to also include the Class / bas page.
Have you placed the library file (.b4xlib) in your additional libraries folder ?
Have you configured your Additional Libraries path correctly in the IDE ? Tools > Configure Paths.
Have you Ticked to include the Wobble Menu lib in your project ?
I'm at a bit of a loss where you managed to get the .bas file from ( I cant locate it in the forum)
You haven't extracted it from the lib file by chance and included it ?
If you still cannot resolve your problem , upload your Project. File > Export as Zip.
if it is a B4XPages Project in Main Page you will see .... 'Ctrl + click to export as zip: ide://run?File=%B4X%\Zipper.jar&Args=Project.zip