Turntin horrorstoryWatch this thread
...submitted it and it got a Turntin receipt just fine but then when I resubmitted the same file...
You say "now there is a Turnitin error"; what was that error? What did it actually say?
The reason I ask is the this article on the Turnitin site says that a 'self-match" is excluded from the report by default "to allow users to make draft submissions without papers matching themselves".
The same article says that, "If required, instructors can exclude any self-match (from the report)".
My reading of this article is that (a) the resubmission should have been identified as being "self matching" and (b) if Turnitin didn't automatically exclude that match from the report, then that can be done retrospectively.
It's natural to worry. However, you've done nothing wrong and even a cursory review of the evidence will confirm that fact.