Ckan refuses to install the mod

[thaurane]

ksp version 1.6.1

Oh no! It looks like you're trying to install a mod which is already installed, or which conflicts with another mod which is already installed. As a safety feature, the CKAN will *never* overwrite or alter a file that it did not install itself.

If you wish to install Mk2Expansion 2:1.8.3.5 via the CKAN, then please manually uninstall the mod which owns: Ships/VAB/M2X Stork.craft and try again. 

Your GameData has been returned to its original state.
Error during installation!
An unknown error occurred, please try again!

If you go into the file location and delete the craft it will throw up another craft claiming its the issue. If you delete them all it just claims there's an unknown error.