Infolog stopped by more critical errors messages

Hello there,

I have this problem in deploying the service group in dynamics 2012. The error below was thrown by. Can anyone help me please to fix it ? What could be the problem ?

Thank you experts !

The port 'PtcCustContractServiceGroup" could not be deployedmError:

c:UsersAdministratorAppDataLocalTempServiceGenerationPtcCustContractServices-cs(34,19): error CS0234- the type or namespace “customerServiceClass” does not exist in the namespace “Dynamics.Ax.Application” (are you missing an assembly reference?)

c:UsersAdministratorAppDataLocaTenpServiceGenerationPtcCustContractServices-cs(34,19): error CS0234-the type or namespace “customerServiceClass” does not exist in the namespace “Dynamics.Ax.Application” (are you missing an assembly reference?)