Why do I get the error "Undefined function or variable 'onCleanup'"?

Hi everybody. Opening programs I get this error:

    Undefined function or variable 'onCleanup'.
    Error in getnicedialoglocation (line 21)
        c = onCleanup(@() close(convertData.hFig));
    Error in msgbox (line 324)
    DefFigPos = getnicedialoglocation(DefFigPos, get(figureHandle,'Units'));
    Error in errordlg (line 47)
    handle = msgbox(ErrorStringCell,DlgName,'error',Replace);
    Error in uiopen (line 194)
        errordlg(err);

What can I do to solve the problem and start using Matlab again?

Answer 1

[ES]

Something is wrong with your path.

onCleanUp resides here. It should be visible on startup.

{MATLAB Installation Directory}\toolbox\matlab\general\onCleanup.m

Try

which  onCleanup
restoredefaultpath

commands

Answer 2

[Jan]

The first point to start is asking the docs about this function. In the current version found on the MathWorks pages (and found by Google):

https://www.mathworks.com/help/matlab/ref/oncleanup.html

There it is mentioned, that the function was "Introduced in R2008a". Do you run an older version? Then it would be useful, if you mention this.