Error evaluating UI Expression at function a!queryEntity

Certified Senior Developer

Received the following error: 

Expression evaluation error [evaluation ID = Y74ZUD6M] in rule 'XX_getclientbyfilters' (called by rules 'XX_mailtracker' > ... > 'XX_form_contractremediation > 'XX_contract') at function a!queryEntity: An error occurred while retrieving the data. (APNX-1-4198-000)

The log also contains the following:

2021-09-16 18:07:10,508 [ajp-nio-0.0.0.0-809-exec-9] ERROR com.appiancorp.rest.record.data.RecordRestService - Unable to retrieve record summary for record w/ type RecordType [id=3, uuid=4da5e8e6-d7ad-4bb5-a397-3888cf6e7898, name=XX Product, sourceTypeStr={http://www.appian.com/ae/types/2009}DataStoreEntity, sourceUuidStr=3e61f35-8eaa-4116-9fb6-cf12cf4ed77c@_a-0000ec9-1284-8000-9ba2-011c48011c48_22996] and id 901

What would cause the error - unable to retrieve record summary? I've tested the rule that is said to error and it can retrieve the record data

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