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CCS: Error in CCS Version 4.2.3.00004

Tool/software: Code Composer Studio

I have created a new project in CCS 4.2.3.00004 using already existing source files. I am facing following error : 

Severity and Description Path Resource Location Creation Time Id
file "../Source/2806x_BootROM_API_TABLE_Symbols_fpu32.lib<TMS320x2806x_boot_rom_out___romApi_Flash2806x_DepRecover_tmp.obj>" specifies ISA revision "C28FPU32", which is not compatible with ISA revision "C2800" specified in a previous file or on the command line ver4 line 0 1488195658759 241

I also have CCS 7 installed on my system.Please help me with the error.