SOA 12c- Runtime faults project error ( "faultMessageType" is set to "bpel:RuntimeFaultMessage" on this activity but it cannot be resolved)

I have used catch for runtime fault and I created the variable for the fault type invalidVariables.

While compiling the project I received the below error:

"faultMessageType" is set to "bpel:RuntimeFaultMessage" on this <bpel:catch> activity but it cannot be resolved (check value of "faultMessageType", imports, WSDLs or XSDs).               BPELProcess.bpel

Solution for this error is:

when we create a variable In Bpel below the code  will add.  Namespace for the runtimefaultMessage is bpelx not the bpel. So change to bpelx.