Weblogic 12.1.2 - ERROR: GWT.create () is only usable in client code! It cannot be called, for exa

Hello experts,

On trying to deploy a war file in Weblogic 12.1.2 and I'm getting the error:

An error occurred during activation of changes, please see the log for details.

Message icon - Error java.lang.UnsupportedOperationException: ERROR: GWT.create() is only usable in client code! It cannot be called, for example, from server code. If you are running a unit test, check that your test case extends GWTTestCase and that GWT.create() is not called from within an initializer or constructor.

Message icon - Error ERROR: GWT.create() is only usable in client code! It cannot be called, for example, from server code. If you are running a unit test, check that your test case extends GWTTestCase and that GWT.create() is not called from within an initializer or constructor.