What is the value of the first parameter (bdHandle) in the function 'CyBle_L2capLeConnectionParamUpdateRequest'?
Try the first parameter as 'cyBle_connHandle.bdHandle'.
Also ensure that the connection parameter values you are entering as second parameter in function is in acceptable range of the Central device you are negotiating it with.
It was an error with auto completion. First parameter was wrong.
Thanks for help !