TypeError: Cannot read property 'length' of undefined about octoprint-bedlevelvisualizer HOT 5 CLOSED

What firmware? If your collector is Bed Topography Report for CSV: your gcode should be G29 T1 I think. Otherwise, change your collector flag to the text displayed just prior to mesh data when running G29 T

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If you're using Prusa firmware your gcode needs to be

G80
G81

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Yes, I've just fixed it -- I had to change it to G28, G81 and change the tag to 'Measured points:'

It's a Prusa i3 mk3

....I was confused because I didn't expect that error code so quickly. I would have expected it to have an error after the bed levelling was done.

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I think there's room to improve the error reporting here ... it's not clear at all how that error results from the incorrect tag (or commands?). I got it immediately when clicking on the UI menu without any delay from the G28 command (G28 does a G80 as well).

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I figured out where the error was being triggered and just updated the 0.0.8 version. If you uninstall and reinstall you should not see these pop-up errors anymore.

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