'There was an error'

[DianaKyalo]

I am trying to append data from a CSV file to a layer and I keep getting an error message, there was an error. What could be the problem?

[DanPatterson]

That error message is indeed strange but has a link on the support site.

It may not be the solution but give it try anyway

Problem: Unable to view data on the Data tab in ArcGIS Online (esri.com)