Changes can not be saved

Hi! I went to download svg icons to this website
I insert the icon in my wen design and all the time is a pop up saying “Changes can not be saving”
I can´t save my file and if I close the Figma sesion, it says my files cannot be saved.

¿Where is the problem?

¿What can I do?

Hi, can everybody help me what is going on with my file. Everything was OK, all these weeks until now, when I wanted to include this credit card icons.
I can´t work because all the time is coming the pop up with this mesage.