theme editor from luvak doesn't work

I have an ti nspire cx calculator with ndless 4.5 installed. I wanted to use the theme editor luvak has made, so i have downloaded the .tns file and placed it on my calculator. I could launch it once and that was it.
It doesn't matter if I choose to open a theme.tns file or the main program, my calculator reboots and nothing has happend. Then I had to reinstall ndless. I have tried to delete the program and install it again but the same happens. Can somebody please help, i would like to use this cool program!
It doesn't matter if I choose to open a theme.tns file or the main program, my calculator reboots and nothing has happend. Then I had to reinstall ndless. I have tried to delete the program and install it again but the same happens. Can somebody please help, i would like to use this cool program!