AdWordsApiException: Exception of type
'Google.Api.Ads.AdWords.Lib.AdWordsApiException' was thrown. The Criterion is
not allowed to be excluded.. (Error: CriterionError.CANNOT_EXCLUDE_CRITERION,
FieldPath: operations[21].operand.criterion.contentLabelType, Trigger: GAMES)
Based on your suggestion in https://groups.google.com/forum/?pli=1#!topic/adwords-api/BHCZoySx10g I added a ContentLabel criterion of contentLabelType = GAMES as a NegativeCampaignCriterion to exclude them from my campaign's ads. It worked perfectly for quite some time until the last few days. Can you please help me with why this suddenly started happening and how can I avoid getting these exceptions. Here's the C# code I use to add a negative criterion to the campaign just in case you need to know.
CampaignCriterion negativeCriterion = new NegativeCampaignCriterion()
{ campaignId = campaignId, criterion = new ContentLabel() { contentLabelType = ContentLabelType.GAMES
}};CampaignCriterionOperation negativeCriterionOperation =new CampaignCriterionOperation(){ operand = negativeCriterion, @operator = Operator.ADD};