--GIP_L2A_AC is an optional argument. It is thought for expert users as is mentioned in the release note for SIIMPC-850. If you use this, you have to specify either the full path where this (your own configuration) is located or you have to put your own L2A_AC_GIPP.xml configuration file in the configuration directory. Unless you have a dedicated reason to use your own configuration file for atmospheric correction , do not use this argument.
Your call should simply be: L2A_Process --resolution=10