Cognos 10.2.1.1 Visualization Customizer

[hmw]

Hi,
I downloaded and installed the customizer tool from IBM on my local machine. When I try to open a zipped 10.2.1.1 visualization, I get the error "Unable to load bundle. Make sure it's not open by another instance of "IBM Cognos Visualization Customizer'"
I am able to open a visJson file and modify it in the tool. I copied the contents and pasting into the original file, renaming the chartTypeDefinition name in the definition file and saving everything with the new name, however it did not work. Cognos failed when I tried to import back into the environment.

I am importing into a 10.2.1 Fix Pack 2 environment. I am assuming this is the same as 10.2.1.1.
Any thoughts?
Thanks
HMW