list of source cannot be read

Hello,

CAElinux 2013 installed recently on I7 core 64 bits seems working well until i try to run Ubuntu software center.
And then password is returned with a message error:

E: line 62in sourcelist/etc/apt/source.list (dist parse)
E: ..../source.list.d/gerris.list (dist parse)
E: go to repository dialog box to correct the pb.
E: cache>failed, report .

I try sudo in terminal but system blocks also.

What to do ? may be return to install Caelinux ?

thanks for your attention.

Claude