Unable to install gnome.platform on flatpak

I tried to install Flatseal which has org.gnome.platform as a dependency.
It fails to install and throws out this error.

Error: Error deploying: While trying to checkout d79ff93caf2d16d30af7c237fb4c63bfc3601f59f1f87cd4366ffd6bf7c9d422 into /var/lib/flatpak/runtime/org.gnome.Platform/x86_64/3.36/.d79ff93caf2d16d30af7c237fb4c63bfc3601f59f1f87cd4366ffd6bf7c9d422-KDWJQ0: Opening content object 4bbc47954a5bbb22b3302aa69ddd66074ef255978b160f644ed1006742a04c5e: Couldn’t find file object ‘4bbc47954a5bbb22b3302aa69ddd66074ef255978b160f644ed1006742a04c5e’
error: Failed to install org.gnome.Platform: Error deploying: While trying to checkout d79ff93caf2d16d30af7c237fb4c63bfc3601f59f1f87cd4366ffd6bf7c9d422 into /var/lib/flatpak/runtime/org.gnome.Platform/x86_64/3.36/.d79ff93caf2d16d30af7c237fb4c63bfc3601f59f1f87cd4366ffd6bf7c9d422-KDWJQ0: Opening content object 4bbc47954a5bbb22b3302aa69ddd66074ef255978b160f644ed1006742a04c5e: Couldn’t find file object ‘4bbc47954a5bbb22b3302aa69ddd66074ef255978b160f644ed1006742a04c5e’

Try to repair it with:

flatpak repair

You can also clean your flatpak install with :

flatpak uninstall --unused

On the other hand, I tried to install this Flatseal, seemed to install, but never launched…

Sorry for not answering immediately I completely forgot to check the forum thread again! I need to setup notifications.
I tried what both of you described and it didn’t work for me. In the end I decided to remove all my flatpak apps and flatpak itself and then manually delete all the files in the flatpak data folders which I found from here Filesystem · flatpak/flatpak Wiki · GitHub
It now works and installed everything without an issue. I don’t know what caused the issue though it might have been user error or some bug but I am unsure.

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