"cannot specify -o when generating multiple output files"

Noob here.  

I am taking over a colleagues project.  The project used to compile just fine, but now throws 256 errors and fails to compile.  The two main errors are "ArmClang.exe: error: unsupported option '--config' ", and "ArmClang.exe: error: cannot specify -o when generating multiple output files ".  

Could this be compiler related?  Project used to use Arm Compiler 6.13, but I am using 6.07.  

Thanks. 

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