Below are possible answers for the crossword clue Error in theory or plan.
4 letter answer(s) to error in theory or plan
FLAW
add a flaw or blemish to; make imperfect or defective
an imperfection in a plan or theory or legal document that causes it to fail or that reduces its effectiveness
an imperfection in an object or machine; "a flaw caused the crystal to shatter"; "if there are any defects you should send it back to the manufacturer"
defect or weakness in a person's character; "he had his flaws, but he was great nonetheless"
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