why do I see error in curve fitting?

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What I try to run the below example given under the link : https://in.mathworks.com/help/curvefit/fit.html
clear; close all; clc;
load census;
it throws following error...
Unable to resolve the name curvefit.attention.Error.
Error in fit>iCreateErrorFunction (line 631)
errorFcn = curvefit.attention.Error();
Error in fit (line 107)
errorFcn = iCreateErrorFunction( nargout > 4 );
Can anyone please help?
MP on 16 Dec 2021
The curve fitting toolbox is located at C:\Program Files\MATLAB\R2021a\toolbox\curvefit\curvefit\fit.m
still it gives following error.
Error using cfit
'fittype' requires Curve Fitting Toolbox.
Error in fit>iFit (line 128)
fitobj = cfit;
Error in fit (line 116)
[fitobj, goodness, output, convmsg] = iFit( xdatain, ydatain, fittypeobj, ...

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Accepted Answer

Walter Roberson
Walter Roberson on 16 Dec 2021
The Curve Fitting Toolbox needs to be reinstalled.
Walter Roberson
Walter Roberson on 17 Dec 2021
It is possible for that message to show up if you have the Curve Fitting Toolbox installed, but somehow do not have a license to use it.
For individual licenses, it is typically only possible to install toolboxes you have a license for, but there are some situations in which it is possible.

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