Hello E A Johnson, 

Welcome to the Community page, 

Here is how to fix it, 

1. open the folder that contains your company file. 
2. Find the files with the same file name as your company files but with extentsions.ND and .TLG.

company_file.qbw.nd

company_file.qbw.tlg

3.Right-click each file and select Rename. Add the word OLD at the end of each file name. Ex: company_file.qbw.nd.OLD

4.Open QuickBooks again and try to sign in to your company file. If the same issue occurs, proceed to solution 2.

you can have a look at this link as well here.