Android Question getting error by trying to use FileHandler

[Mehrzad238]

hello, I'm trying to use FileHandler in my project using this example:
TextEditor - Save and load external files

but I'm facing with this error:

Unknown type: b4xmainpage<br />Are you missing a library reference?

I attached the screenshots.

I'm using b4a not b4x Does that have something to this? if it does what is the replacement?

 

[Erel]

Don't add a reference to B4XPages library if this is not a B4XPages project.