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Siva Tej EarlaSiva Tej Earla 

System.DmlException: Insert failed. First exception on row 0; first error: FIELD_CUSTOM_VALIDATION_EXCEPTION, too small amount for Opprtunity: [] came across this error in roll-up summary trailhead challenge. any thoughts on how to resolve this?

Challenge Not yet complete... here's what's wrong: 
There was an unexpected error in your org which is preventing this assessment check from completing: System.DmlException: Insert failed. First exception on row 0; first error: FIELD_CUSTOM_VALIDATION_EXCEPTION, too small amount for Opprtunity: []
gaurav arora 33gaurav arora 33
check if you have any validation rule on Opportunity.
Amit Chaudhary 8Amit Chaudhary 8
Please deactivate the validation rule / Trigger which you created on opportunity for Opportunity Amount "too small amount for Opprtunity". and try again
Siva Tej EarlaSiva Tej Earla
there is a trigger on this I totally forgot :D . Thanks guys