Hi, this error occurs in the new versions of MATLAB (version = 2018b)
This error occurs when you have defined a method in a separate file,
This occurs for the both static and regular methods.
When every thing is correct and even the MATLAB auto-completion finds the method,
but when you call the method, the error "Method is not defined or is removed from MATLAB search path" occurs.
Note that this error is automatically resolved when MATLAB is restarted multiple times!
I think it is a bug in the new versions.