Form 540 is the CA state return, you need this form is you are required to file a tax return in the state of CA. If you are receiving a message that you cannot file your form 540 that means the form 540 has not been finalized and is not ready to be filed.
To check to see when form 540 will be finalized click here: https://care-cdn.prodsupportsite.a.intuit.com/forms-availability/turbotax_ca_online_individual.html . Once it has been finalized and released you will be notified and cam file your return.
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