Creating Custom Symbols

I created a custom symbol with the variable template in Symbols 3.0. When I check the template in Symbols 3, it says it's missing the guidelines but gives the check mark for everything else. When I import the symbol into the custom symbols folder, the app crashes. I found the way to delete it so the app stops crashing but I'd like to understand what/if something is wrong with the svg file I am creating.

Creating Custom Symbols
 
 
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