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Error ERROR: No applicable methods for #

Dear List,
I face the following error when entering the preferences.
I just re-installed OM with the new version 6.9 and I changed the settings for the MIDI playback
so the error coming out is:
ERROR: No applicable methods for #<standard-generic-function capi:display-tooltip 21015ED2> with args (#<om-tab-layout [8 items] 24A33C13>

Thankx for your help

sorry, never seen this before
can you detail the different steps and actions that cause this error ?
does it reproduce systematically ?