Why won't MATLAB let me open any files, scripts, or anything at all?

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Anant Hariharan
Anant Hariharan on 14 Nov 2017
Commented: Walter Roberson on 11 Apr 2018
If I try opening a file or script by clicking on it from the command window, I get the following error:
Error using fullfile (line 51)
String input not supported.
Error in toolboxdir (line 22)
s=fullfile(matlabroot,'toolbox', tbxdirname);
Error in matlab.ui.internal.dialog.DialogUtils.imreadDefaultIcon (line 38)
iconFileName = fullfile(toolboxdir('matlab'), 'uitools', 'private', ['icon_' iconName '_32.png']);
Error in msgbox>setupStandardIcon (line 438)
[iconData, alphaData] = matlab.ui.internal.dialog.DialogUtils.imreadDefaultIcon(iconName);
Error in msgbox (line 353)
Img = setupStandardIcon(IconAxes, IconString);
Error in errordlg (line 47)
handle = msgbox(ErrorStringCell,DlgName,'error',Replace);
Error in uiopen (line 194)
If I try opening a file by using the open command, I get a different error (see below). Either way, I can't open any scripts at all!
Error using which
Arguments must contain a character vector.
Error in finfo (line 60)
openAction = which(['open' ext '(''char'')']);
Error in open (line 114)
[~, openAction] = finfo(fullpath);
Any suggestions? I've been a MATLAB user for 3 years and this has never happened before.

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Answers (2)

Walter on 11 Apr 2018
The same problem here. I am confident the code is fine because it runs using 2016a but once upgraded to 2017b nothing works.
  1 Comment
Walter Roberson
Walter Roberson on 11 Apr 2018
As I posted above,
"One of the ways that you can end up with a string instead of a character vector is if you used uiimport, which in the last couple of releases has defaulted to importing text as string instead of as character vector."

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