Understanding and Fixing LibreOffice Calc Error 509: "Missing Operator"
Common Formula ERROR Codes 502, 509, or 522 in LibreOffice Calc Err:509
Help you if you paste it here Explain how to avoid this error when importing Excel files Let me know how you'd like to proceed. Err:509
In short: Calc expects an operator (like + , - , * , / ) between operands but finds something else instead. What Causes Error 509? Err:509
If you are using implied multiplication, you must make it explicit. =(A1)A2 Right: =(A1)*A2 3. Check for Misplaced Spaces or Characters
Show you that frequently trigger this error
A slight misspelling or misplaced operator inside complex formulas.