Execution Error in service script

[magrawal]

I have service which receives a string as input and result number as output. I have tested service is working as expected.

I have binded that service with value display widget and input to service through mashup parameter. When running mashup I am getting error: "Execution error in service script [Thing serviceName] : TypeError: Cannot call method "serviceName" of null (serviceName#2)"

[posipova]

Are you logged in as Administrator?  Is the parameter type matching your service value type?

[LeenaAgarwal]

Looks like the logged-in user does not have access (visibility) to the entity on which the service is defined.