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I've been running Sigil on UbuntuStudio 20.04 since it was issued - Sigil 1.1.0. with epubcheck plugin 0.4.5. I've had no problems with this combination. Today I started some new work on an epub and got a prompt telling me version 0.4.6.2 of the plugin was available.
After downloading and installing 0.4.6.2, I re-ran a check on my epub file in Sigil and it found the usual advisories about the odd in-line style in some files. But it also produced an error which I have never seen before :
*** Internal error. bk.readfile() failed for: temp.epub
If I go back to plugin 0.4.5, this error does not exist.
Running java -jar epubcheck.jar myebookfile.epub gives a good result with zero errors.
Should I be concerned about the internal error? What does it mean?
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