You will need to find and download those plugins and paste them into this folder of your Construct 2 Path:
.\Construct2\exporters\html5\plugins
OR (NOT RECOMMEND)
You can open your .caproj file with Notepad or Notepad++.
Find the keyword "Cocoon" and delete them but need to follow the tag of file.
This option is very risking to damage your file.
You must back up your file first.