Understood. Installing an upgrade should be done on your proper timing.
So what has likely happened is that the posting journal data file was removed outside of using Adagio (ie manually deleted, not written to during a post, restored from a data backup, etc).
The solution is to create and post a new invoice batch - it could be for $0.00, just as long as something posts successfully. If you have 'auto print posting journals' enabled, do not print the invoice posting journal at this time.
Instead open the Invoice Posting journal screen and you should now see a larger range of posting sequences, from the one you are having a problem with, to the one that you just posted. Keep that entire range and print to file and purge. This should reset the system to what the expected range of available posting sequences is, namely nothing.
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Regards,
Softrak Tech Support