the addon is installed and blender gave me a error message that said can not find ogre xml converter, despite me giving it the path to the converter and following instructions and a .xml file. i manually the opened the .xml file with the ogre xml converter and got a .mesh. that does this with only with this .blend and it derivatives but not others. the blender errors are like this: and what it looks like mesh viewer also i do not think anything is wrong with the .blend file,
also no clue what is wrong. sorry for late reply