I'm a newbie with FreSurfer and Linux. I'm following Longitudinal Processing-Tutorial. now I have only files of tutorial data set and I don't have any other file to test. I can run Freeview and I can load volume from terminal and from interface, but when I try to load surfaces (from  terminal with correct command -f OAS2.... or from interface of Freeview) I have the same result: Freeview interface crashes and in the terminal I find:

MatrixMultiply: m2 is null!

No such file or directory.

I tried also with other surfaces and I had the same result. 

Furthermore when I installed long-tutorial in $FREESURFER_HOME/subjects directory the directory long-tutorial was with another owner and I had to change owner with command "chown -R", or                 

I couldn't use it. I tried also to remove the directory and reinstall long-tutorial but the problem of owner still remains and I had to run "chown -R" in order to  have access to the directory and its files.

I followed instructions to the letter but now 

I don't really know how to fix it.

sorry for my english

thanks

 

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