Android Question Error code

Ugochi Adenols

Licensed User
Am getting this during compilation. what should i do?

B4A Version: 8.80 BETA #1
Parsing code.    (1.20s)
Building folders structure.    (1.09s)
Compiling code.    (3.18s)
Compiling layouts code.    (0.37s)
Organizing libraries.    (0.00s)
Generating R file.    (2.57s)
Compiling debugger engine code.    (47.01s)
Compiling generated Java code.    (58.71s)
Convert byte code - optimized dex.    (43.52s)
Packaging files.    Error
Unable to add 'classes.dex' to 'bin\temp.ap_': file not found