In your file I found a layer at the very bottom called “namedview7576”. It didn’t seem to have anything in it, so I deleted it. Once I did that the file loaded fine.
I opened the SVG in Inkscape, Ungrouped everything (there’s a group within another group) then converted the Rectangle objects to paths, then the file loaded into the GFUI.
Which leads to the question — are you using Inkscape? (and saving as an Inkscape SVG or plain SVG?)
The file looks like it was exported by Illustrator but originally developed in Inkscape. I believe the namedview is a function of an Inkscape SVG. The tell-tale of that is SodiPodi - which was the origins/predecessor of Inkscape. Some of the stuff that it creates isn’t really SVG-compliant, which is where some problems come from.
I’m not at a computer to screenshot it. Maybe one of the Inkscape users here can screenshot it real quick. Yo should be able to select between Inkscape SVG or Plain SVG in the Save As dialog box.
BTW: now that it has been mentioned… Is there a way to set the default to plain SVG vs. Inkscape SVG? Tried to find a preference for that a few months ago and was unsuccessful. I often forget to select the correct one.
I’m glad you resolved it! Thank you @cynd11 for finding that. I’m going to close this thread - if the problem reoccurs, go ahead and post a new topic. Thanks for letting us know about this.