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CC2541: Error in accessing external variable

Part Number: CC2541

Hi,

I am using the keyfob code on stack 1.4.2.2,have defined the variable in the simpleprofile.c  and i am trying to access the data in application code to read the value received from mobile app

when i trey to copy the received data from mobile app in simpleprofile_WriteAttrCB it shows error as Error[e46]:Undefined external.

i have tried the reverse way as well  that is declaring variable in application and accessing it in simpleprofile still the result was same. i am using IAR9.30,Evaluation version

once or twice it worked but after i rebuild the error started.

Please Suggest..!!!

Regards 

Atul