We're using Appian 25.4.
We have a ReadOnly Grid that gets it data from a Record, which has a DataSource of a Process Model.
Recently, we added 3 new fields to a CDT used in this Process Model as a Process Variable (note this CDT does not get written to the database at any point), and updated the grid to include one of these new fields. Since then, when we export the grid to Excel, we get the error "Query has failed: null". Undoing the changes we made results in the same problem, which has lead me to believe it's a problem with the data in the process instances, especially as when we filter the data on the grid to exclude instances that have these changes, we don't get this error at all.
The really strange thing is this error isn't consistent, as we've been able to export data that includes the changes we've made to the process model, the CDT, and the grid.
Has anyone else encountered this particular error message?
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