I know this was 1.5 years ago, but just in case anyone else comes across this - I had this error come up when trying to use the Arcade FeatureSet function. It turns out it was because I was using a map image layer, rather than a feature layer. This might have been your same issue (ie. not using a feature layer). I couldn't find anything about the error online, so hopefully this can inform others who run into it!
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ArcMap ver. 10.2 I have a line feature. It is the result of two separate polygon features being converted to line, and merged together. A high number of dangles are expected. However, my error checker is not finding any of these errors. Topology properties: Feature class: 2016_Merge Rule: "Must Not Have Dangles (line)" Initially, I created the topology through model builder, and it didn't work. I deleted it and created it manually, but I am still running into the same issue. I am selecting 'Validate Entire Topology'. The correct topology has been selected and is the only topology open in the mxd. On the Error Inspector, I have checked both the Exceptions and the Errors list, and have disabled 'Visible Extent only'. I have tried everything I can think of - am I missing something obvious? The spatial reference for both the feature dataset and geodatabase and the dataframe in the mxd are all the same, as well (UTM10) Here is an example of the line feature class I am working with, which appears to have dangles: Error Inspector: Topology properties:
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