How can I have an "input argument" error without input ?

I have an issue with an "input argument" error but my function doesn't take any input. Can someone help me about it ?

[Stephen23]

Please show us the complete error message, this means all of the red text (and not just the bits that look interesting to you).

Also show us exactly how you are *calling your function.

Answer 1

[Dave Behera]

Can you show the function definition and the error? Are you sure you don't have multiple functions with the same name and that your function's name does not match a MATLAB built-in function?

Answer 2

[Antoine Devingt]

I found the solution. I just needed to add this.@function into fmincon to don't get this error. Thanks for the help.