Attach existing textlabel to new adgroup

[Margaret]

I'm trying to create a new adgroup and attach an existing label to it.  I'm getting this error:

'methodName': mutate, 'serviceName': AdGroupService, 'operations': 1, 'faultMessage': "[EntityNotFound.INVALID_ID @ operations[0].operand.labels[0].id; trigger:'LabelId: #####'

I know the label id is right because my code just got it using labelservice.get().  When I try to create a new label instead, with the same text, I get this error:

'[LabelError.DUPLICATE_NAME @ operations[0].operand.name]'.

How can I get the adgroupservice to recognize that the label with the labelid that I sent it exists?

[Shwetha Vastrad (AdWords API Team)]

Hi, 

Could you enable logging and provide the SOAP request and response logs for the AdGroupService.mutate() request which encountered the EntityNotFound.INVALID_ID error? Please use Reply privately to author when responding. 

Thanks,

Shwetha, AdWords API Team.

[Abdul Samad]

Put the code in try catch to avoide duplication errors.