Consult the owner's manual. There is usually a list of error codes in the Troubleshooting section that discusses error codes and how to resolve them.
Error Codes differ from brand to brand, so it is best to search for your machine's make, model plus "E1," ie:
Frequently Asked Questions
Why is my Kenmore sewing machine locked up with an E1 error code displayed...
Simple Fix for Janome E1 Error
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