MATLAB permission error in Linux Ubuntu 18.04

I've installed MATLAB in Ubuntu 18.04.

When I open MATLAB it gives me a warning that the desktop configuration was not saved succesfully. When I try to use any command in the command window, it gives me an exception.

The desktop configuration was not saved successfully
>> clear
An error was encountered while saving the command history
java.io.FileNotFoundException: /home/shihab/.matlab/R2019a/History.xml (Permission denied)
	at java.io.RandomAccessFile.open0(Native Method)
	at java.io.RandomAccessFile.open(RandomAccessFile.java:316)
	at java.io.RandomAccessFile.<init>(RandomAccessFile.java:243)
	at com.mathworks.mde.cmdhist.AltHistoryCollection$CommandSaver.run(AltHistoryCollection.java:1214)
	at java.lang.Thread.run(Thread.java:748)
 

Any help would be appreciated.

I tried two commands, but they didn't help

sudo chmod -R 777 /usr/local/MATLAB/R2019a/

sudo chown -R $LOGNAME: /usr/local/MATLAB/R2019a

But neither of them worked. If I use MATLAB with from a root terminal, I don't get any errors.

[Walter Roberson]

/home/shihab/.matlab/R2019a/History.xml is the file that is having the problem. You should be granting permission for that file specifically or for /home/shihab/.matlab/R2019a directory.

[Mohd Shihabuddin Khan]

Thanks a lot Walter. It worked. Now that I look at it, it was so obvious. Thanks for helping out. :)