Build bug in apk file

MIT App Inventor Help
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1

hello
I’m trying to build my project it keelp displaying
App Inventor is unable to compile this project.
The compiler error output was

ERROR: appinventor/ai_maryamshafeek100/thrive_1/reduce.yail line 34: duplicate declaration of 'back'

ERROR: appinventor/ai_maryamshafeek100/thrive_1/reduce.yail line 34: (this is the previous declaration of 'back')

[GenerateClasses] ERROR: Can't find class file for Screen 'reduce'
[GenerateClasses] Task errored in 3.353 seconds

2

It seems you have any componet called "back"...change its name to lbBack, btBack o whatever...