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Please have a look at http://www.cypress.com/?app=forum&id=167&rID=61042. Keil will ingore the interrupt TMR1_VECTbecase of #pragma NOIV, which tells keil do not generate interrupt vectors. #pragma NOIV affects only the source file on which it is added. Make a new source file for your timer ISR. It should work.
This error is related to the address space constraints. This may arise if the values entered in Keil settings is conflicting against the actual code size. Please double check the values that you have provided at Project – Options for Target Dialog box. You would have specified the code range values either in the "Target" tab or in the "BL51Locate" tab. Please odify the value according to your application, and this should sove your issue.