Getting UI error while accessing task

Certified Senior Developer

Hi

while user trying to access the task was getting the UI error like below but i am accessing with service account i am not getting error like below checked the security of document and folder everything seems fine please suggest on this 

Error

Error Evaluating UI Expression Expression evaluation error [evaluation ID = c9b13:9d17a] in rule 'dm_attachmentreviewsection' (called by rule 'dm_executiontaskfor') at function 'document' [line 27]: User Does Not Have Rights to Perform this Operation 

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