Error when opening the Plugins tab: “The data couldn’t be read because it isn’t in the correct format.”

Hello!
I’m having an issue with Glyphs and I’m hoping someone can help me solve it.

Everything was working perfectly yesterday, but today the app started showing this error when I try to access the Plugins tab:

“The data couldn’t be read because it isn’t in the correct format.”

Screenshot:

I searched the forum and found a topic describing a similar issue. I followed the suggested steps (including clearing the plugins folder/cache and reinstalling Glyphs), but unfortunately nothing worked — the error still appears every time I open the Plugins tab.

Does anyone have any other ideas or suggestions on how to fix this?
Thanks in advance!

That means that Glyphs somehow can’t download the plugin manager data file. In your network, can you access GitHub?

When I opened the glyphs, the problem disappeared in the same way it appeared…