The octoprint-marlin-flasher plugin does not work with octoprint 1.4.0 since it requires flask 0.10 and octoprint 1.4.0 now uses a newer version.
if you have marlin flasher installed.
pls uninstall first otherwise octoprint will not start since the flasher causes a downgrade of the flask plugin.
You should consider creating an Issue on their repository so that they'll know about this. It's probably just a one-line change.
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Thx, just opened a case.
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