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Below are instructions to resolve the invalid check issue.

Troubleshooting: Invalid QuickBooks Check Error

https://www.halfpricesof...kbooks_invalid_check.asp 

If this solution does not work, please follow #8 in this guide and send us the data file "qbfile0001.txt". We are glad to assist you.

Thank you.

Casey
Casey
Please feel free to contact us directly  if you need assistance
Small Business Payroll & Tax Software Solution
https://www.halfpricesoft.com 
Hello Sir,
I sent you the error message we are getting while printing checks from Quickbooks, but you sent us
the same page of troubleshooting which is showing on the error. We already worked and tried those options and couldn’t succeed, that’s the reason we reached your company.
Never knew it will be such a hassle to print checks with your product, every week when he have to use, we go through the same pain, it never works normally.
We cannot even reach your customer service via phone, its just email and the responses in the email are general troubleshooting, nothing related to our specific issues
Please let us know if someone can contact us via phone and walk us through these errors or refund the money. We are done with this struggle, leaving all the work
And struggling to print the checks is just ridiculous.
Please cancel and refund our money if there is no support.
Thank You