We would like to once again remind you that after February 29, 2012, calls made using the following AdWords API versions will return errors:
  • AdWords API versions v13, v200909, v201003, v201008, v201101
We strongly encourage you to make the move to v201109 before the February 29th deadline. This will give you the opportunity to identify any issues before it is too late to roll back to previous versions.

In addition, check that you have no automated or scheduled scripts running that are using old code.

To ensure that your code uses only v201109, be sure you are using the latest version of our client libraries.

If you have specific migration questions, you can asking them in upcoming office hours or on the forum. Additional migration resources are available here.