There was error submitting the form, the changes were not saved error while editing api group

Document ID : KB000098413
Last Modified Date : 30/05/2018
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While editing an existing api group it fails and you will see below error in catalina.out log

05/17 11:35:21.609 INFO (http-nio-37080-exec-10:) - [FormDefinition general] -- <Failures><Failure message="" name="GroupMembers" type="formfield" code="cms-groupmembers-validationURI"></Failure></Failures>

Api Developer Portal 3.5
The catalina.out has the output of the /portalman/1/apis gateway API which contains a list of the APIs on the gateway. Now compare each key for the Group Members with output of /portalman/1/apis and you will see there is a missing key missing in the output.

Navigate to /sitebuilder/content/groups/ApiPackageGroup in cms and find the .xml file related to faulty group and remove the Api key which you which you figured out from above comparison