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CCS/TMS320F28377S: illegal ISR trap

Part Number: TMS320F28377S

Tool/software: Code Composer Studio

I am working on CCS VER 6.2.0.00050 . and I using sprintf in many place to display some floating point value on GLCD. But when I try to add a new function in my code then in debugging mode my processor stack at one place "interrupt void illegal_isr (void)"(see attachment). please tell why

 this happen  and what is solution.