Did you already validate the SVG?
If the validator shows errors, you could fix them in the code (make a copy of the file before doing so)
You could also try and install a different version of Illustrator and try there.
Does the file open in Inkscape? If so, try and open it, then save it with a different name.
Illustrator is famous for not properly being able to open SVGs it has previously saved. SVG in Illustrator is a one-way street. You either import them (and then save them as AI) or you export them (only to never touch them again in Illustrator). Your work file should be AI, the native file format.
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