How do i fix Error code: -81901, type: VALIDATION_ERROR)?

Hello, Rhodak. 

I'd like to ask for further details about the error code: 81901. Also, I'd like to know which part in QuickBooks and what specific transaction did you encounter that error. Could you provide me with a screenshot? Any information would help me determine what is the error and what's causing the error. 

Looking forward to hearing from you, Rhodak. Keep safe.