MATLAB Version: (R2019b) hangs and does not boot

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Suddenly, MATLAB Version: (R2019b) Update 3 hanged on usual startup by clicking. I re-installed MATLAB R2019b. But, it did not work.
It starts from termonal using the following command.
The following is the copy of the terminal display:
kawahara@MacBook-Pro-4 /Applications % /Applications/ -nodesktop
< M A T L A B (R) >
Copyright 1984-2019 The MathWorks, Inc.
R2019b Update 2 ( 64-bit (maci64)
November 7, 2019
To get started, type doc.
For product information, visit
>> ver
MATLAB Version: (R2019b) Update 2
MATLAB License Number: 261874
Operating System: Mac OS X Version: 10.15.2 Build: 19C57
Java Version: Java 1.8.0_202-b08 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
MATLAB Version 9.7 (R2019b)
Audio Toolbox Version 2.1 (R2019b)
DSP System Toolbox Version 9.9 (R2019b)
MATLAB Compiler Version 7.1 (R2019b)
Signal Processing Toolbox Version 8.3 (R2019b)
>> exit

Answers (1)

Hideki Kawahara
Hideki Kawahara on 7 Jan 2020
Finally, it was fixed.
I started MATLAB with nodesktop option.
/Applications/ -nodesktop
Then, started desktop from the command line.
It opened the usual desktop.
Then, exit using the menu-bar.
Next time, I was able to start MATLAB by clicking the MATLAB icon.

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