Unable to open up any m-files. Running Ubuntu

For some reason I am unable to open up m-files right now. Matlab boots up fine, but when I try to open up an m-file I get this error

Undefined function or variable 'eml_allow_enum_inputs'.

Error in isequal (line 7)
eml_allow_enum_inputs;

Error in cell/strcat (line 32)
if isequal(maxsiz, -1)

Error in uiopen (line 63)
    allML(1)=strcat(allML(1), ';*.mdl;*.slx');

This happens for any m-file I try to open. I have all of the files I am using added to my path, so I don't think that is the problem.

I'm running Ubuntu 12.10.

Thanks

Answer 1

[Walter Roberson]

Try

which -all isequal

It should be a built-in, but it appears something prior to that on your path has it as a .m file.