See this TurboTax support FAQ for the error code - https://ttlc.intuit.com/turbotax-support/en-us/help-article/import-export-data-files/error-567809-102348-cannot-save-tax-file-file/L4rpm9zSL_US_en_US?uid=lrdo89im
I got the same error and can't believe an appropriate 'fix' is to start all over! You can not sell defective products. Your software has a glitch which I believe is happening after using the NEW 1099 NEC portion.