This happens from time to time. Try clearing your browser's cache and deleting your cookies, then try again.
See the TurboTax Help articles How to clear your cache and How do I delete cookies? for guidance.
If this doesn't help, see the TurboTax Help articles State install/e-file update loop: State not installed after installation or TurboTax needs to update... and Why am I stuck in a loop in the File section of my return? for guidance.
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