Err:509 -

The core reason for this error is that the formula structure is invalid because a mathematical link is missing between numbers, cells, or functions. Common scenarios include:

For a quick visual overview of common LibreOffice formula errors, including 509, you can view this educational video explanation . If you'd like, I can: Err:509

Writing 2(A1+B1) instead of 2*(A1+B1) . Calc requires the explicit asterisk operator. The core reason for this error is that

If you are using implied multiplication, you must make it explicit. =(A1)A2 Right: =(A1)*A2 3. Check for Misplaced Spaces or Characters such as =A1 B1 .

Two values or cell references are placed next to each other without an operator, such as =A1 B1 .