MATLAB: Readtable functionality in matlab.

output argument "book" (and maybe others) not assigned during call to "matlab.io.spreadsheet.internal.createworkbook".

Hello all,
I am using readtable function in matlab, but unfortunately, i changed some internal function, which is giving me the following error : Output argument "book" (and maybe others) not assigned during call to "matlab.io.spreadsheet.internal.createWorkbook".
Can anyone please tell me how to get back the default function set up?
Thanks in advance!!!
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