Why running PhpStorm 2021 I got error of lacking memory in my OS? - phpstorm

Question

Working in PhpStorm 2021 I got error of lacking memory in IDE in my Kubuntu 20 (I installed it 3-4 months ago). I ignored it but after restarting I failed to run the OS.
$ /opt/PhpStorm-2021.1.4/PhpStorm-211.7628.25/bin/phpstorm.sh
Error occurred during initialization of VM
Initial heap size set to a larger value than the maximum heap size
I cleared all directories inside of /home/user/.cache/JetBrains as I supposed that my cache raised to big size so I cleared space in root of my OS.
I upgraded my OS with the following command:
sudo apt-get update
sudo apt-get upgrade
but after restarting I still got the same error.
I have in my OS:
$ free
total used free shared buff/cache available
Mem: 8067380 1399884 4747912 198804 1919584 6202076
Swap: 2104476 0 2104476
$ lsb_release -d; uname -r; uname -i
Description: Ubuntu 20.04.3 LTS
5.11.0-37-generic
x86_64
$ df -HT
Filesystem Type Size Used Avail Use% Mounted on
udev devtmpfs 4.1G 0 4.1G 0% /dev
tmpfs tmpfs 827M 2.1M 825M 1% /run
/dev/sdb2 ext4 53G 28G 23G 55% / // I HAVE A LOT OF FREE SPACE
tmpfs tmpfs 4.2G 0 4.2G 0% /dev/shm
tmpfs tmpfs 5.3M 4.1k 5.3M 1% /run/lock
tmpfs tmpfs 4.2G 0 4.2G 0% /sys/fs/cgroup
/dev/sdb7 ext4 30G 13G 16G 44% /var
/dev/sdb1 ext4 339M 208M 106M 67% /boot
/dev/loop0 squashfs 155M 155M 0 100% /snap/chromium/1864
/dev/sdb8 fuseblk 399G 151G 248G 38% /mnt/_work_sdb8
/dev/loop2 squashfs 59M 59M 0 100% /snap/core18/2253
/dev/loop1 squashfs 140M 140M 0 100% /snap/chromium/1878
/dev/loop4 squashfs 261M 261M 0 100% /snap/gnome-3-38-2004/87
/dev/loop7 squashfs 66M 66M 0 100% /snap/core20/1328
/dev/loop3 squashfs 59M 59M 0 100% /snap/core18/2284
/dev/loop6 squashfs 173M 173M 0 100% /snap/gnome-3-28-1804/161
/dev/loop5 squashfs 132k 132k 0 100% /snap/bare/5
/dev/loop8 squashfs 69M 69M 0 100% /snap/gtk-common-themes/1515
/dev/loop9 squashfs 69M 69M 0 100% /snap/gtk-common-themes/1519
/dev/loop10 squashfs 46M 46M 0 100% /snap/snapd/14295
/dev/loop11 squashfs 66M 66M 0 100% /snap/core20/1270
/dev/loop12 squashfs 46M 46M 0 100% /snap/snapd/14549
/dev/sda6 fuseblk 237G 122G 115G 52% /mnt/Work_sda6
/dev/sda1 fuseblk 65G 58G 7.2G 89% /mnt/Win_sda1
/dev/sda8 fuseblk 628G 626G 2.7G 100% /mnt/Media_sda8
tmpfs tmpfs 827M 17k 827M 1% /run/user/1000
I found file /home/user/.config/JetBrains/PhpStorm2021.2/phpstorm64.vmoptions
-Xmx984m
-Xms128m
-XX:ReservedCodeCacheSize=512m
-XX:+UseG1GC
-XX:SoftRefLRUPolicyMSPerMB=50
-XX:CICompilerCount=2
-XX:+HeapDumpOnOutOfMemoryError
-XX:-OmitStackTraceInFastThrow
-ea
-Dsun.io.useCanonCaches=false
-Djdk.http.auth.tunneling.disabledSchemes=""
-Djdk.attach.allowAttachSelf=true
-Djdk.module.illegalAccess.silent=true
-Dkotlinx.coroutines.debug=off
-Dsun.tools.attach.tmp.only=true
Has it relative options? I tried to modify it (I googled some refs in net) :
-Xms5096m
-Xmx4096m
-XX:NewSize=1024m
-XX:MaxNewSize=1512m
-XX:ReservedCodeCacheSize=512m
-XX:+UseG1GC
-XX:SoftRefLRUPolicyMSPerMB=50
-XX:CICompilerCount=2
-XX:+HeapDumpOnOutOfMemoryError
-XX:-OmitStackTraceInFastThrow
-ea
-Dsun.io.useCanonCaches=false
-Djdk.http.auth.tunneling.disabledSchemes=""
-Djdk.attach.allowAttachSelf=true
-Djdk.module.illegalAccess.silent=true
-Dkotlinx.coroutines.debug=off
-Dsun.tools.attach.tmp.only=true
Restated OS and the same error.
I have a SSD (sdb and on Linux partitions are located on it) and HDD (sda) on my laptop and I do not use any virtual machines...
What could raise this error and how it can be fixed ?