Too many arguments were passed to the X function. The maximum argument count for the function is N.

The function received more arguments than its signature allows.

Why it happens

• An extra comma or argument.
• Confusing two similar functions' signatures.
• A mismatched SWITCH/IF nesting where value/result pairs got out of step.

How to fix it

1. Check the function signature and remove the extra argument.
2. SWITCH takes an expression followed by value/result pairs, then an optional else — count them in pairs.
3. Format the expression to see the argument boundaries.