Last import failed with error: Hmmm ... looks like we stumbled a bit, please try again or contact Atlassian support if the issue persists. (§EN-510)
did u check the following thread https://community.atlassian.com/forums/Jira-questions/Hmmm-looks-like-we-stumbled-a-bit-please-try-again-or-contact/qaq-p/1334782 ?
Fabio
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