In the process of setting up DFW-Analytics DataFeedWatch needs to create a new custom dimension in your Google Analytics property. We do that in order to assign traffic to the proper channels and products.
By default Google allows up to 20 custom dimensions per property. If you have reached that limit already there are 3 possible solutions:
Reuse one of the existing custom dimensions
Look through the existing custom dimensions and consult with your team. There is a good chance that some of the custom dimensions are out of use.
Create a separate property
Another way to overcome the issue is to create a separate property to which DataFeedWatch could connect. Instructions can be found here: https://support.google.com/analytics/answer/1042508?hl=en
Each property required its own GA tag. If you decide to go with this solution make sure you put the new tag on your website. Preferably also link your Adwords account to this newly created property: https://support.google.com/adwords/answer/1704341?hl=en
Upgrade to Google Analytics 360
Google Analytics 360 is a paid version of Google Analytics. It allows up to 200 custom dimensions per property. It is only of course only one of the many benefits you get with the paid version.
You can read more about it here: https://www.google.com/analytics/360-suite/analytics/