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Why do I receive License Manager Error -1?

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Why do I get the following error:
ERROR: License Manager Error -1.
Cannot find license file

Accepted Answer

MathWorks Support Team
MathWorks Support Team on 18 Jan 2021
Edited: MathWorks Support Team on 18 Jan 2021
This error is either a result of a missing license.dat file, or not having read permissions to the license.dat file.
To check the license file, please refer to solution 1-63ZIR6
Where are the license files for MATLAB located?
If you're using a network installation, contact your license administrator for a new license file.
If you have a standalone license try starting MATLAB from the bin folder. 
Windows - C:\Program Files\MATLAB\R20XXx\bin\matlab.exe
Linux - /usr/local/MATLAB/R20XXx/bin//matlab
Mac - /Applications/MATLAB_R20XXx.app/bin/matlab
If MATLAB starts properly, delete the shortcut and create a new one.
How do I create a shortcut or link to MATLAB?
If you are receiving this error when entering a PLP for MATLAB R12 or R13 on Windows, this is a result of using a passcode generated from the license center. These PLPs will work as far back as R14. Any earlier passcodes will need to be requested from our Customer Service team here:
This error can also occur when you have borrowed a MATLAB seat from a network-based license and the borrowed seat has expired. To resolve this error, you must re-connect to the network license manager and check-out the MATLAB seat again. 
  3 Comments
abdallah abdelazez
abdallah abdelazez on 15 Nov 2020
Hey, I have the same error messege, although I have 2014 version working fine, when I downloaded the 2018 version I'm getting this same error, what can I do about it?

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