Typically the best bet is to try a different browser when this type error occurs. 

Also, the following link points to additional steps you can take:
https://ttlc.intuit.com/replies/6222610

This  happens in Desktop edition as well. A different browser is not the issue. 

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@dv146164 wrote:

This  happens in Desktop edition as well. A different browser is not the issue. 

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What were you trying to do when you received this error?

Having the same issue...on startup...says it cant load the forms...wont even launch(desktop version)

Please follow the troubleshooting steps here to try to resolve the issue. 

If after doing the above the error still happens, please comment and let us know. @dean2

No Luck....Same error "Forms are missing.  Cannot load start a return Error 214"  and i have to use the activation code again to start it...

Please sign out of the TurboTax software, sign back in and check for updates under the Online tab.

If you continue to experience this issue, please contact us. To speak with a Product Support Specialist via phone, follow the instructions in the following Help Article:  How do I contact TurboTax?

@dean2

That seems to have worked...it crashed the first time after updating and starting a new return, but on the second restart it seemed to be fine...thank you so much!!