I got it working. I was pointing to the Reference:
C:\Inetpub\wwwroot\<project Name>\CuteEditor_for_NET6\Framework 1.x\bin\CuteEditor.dll
instead of
C:\Program Files\Cute Editor\Framework 1.x\bin\CuteEditor.dll
Then, I noticed that the bin files were different. My directory was only including CuteEditor.dll. I added these files:
cuteeditor.lic
NetSpell.SpellChecker.dll
it-IT.dic
fr-FR.dic
es-MX.dic
es-ES.dic
en-US.dic
en-UK.dic
en-GB.dic
en-CA.dic
en-AU.dic
de-DE.dic
CuteEditor.ImageEditor.dll
and I added an Abra-ca-dab-ra, it worked.
Thanks for you help.