First make sure that your tax return has all forms and schedules finalized so that the return can be e-filed.
Click on the Review tab. If there are dates shown for a form or schedule that is when they will be finalized and until that date you cannot file a tax return.
Otherwise, see the TurboTax support FAQ for the error you are receiving - https://ttlc.intuit.com/community/bugs-and-error-messages/help/transmission-error-601errv-rt-10-site...
