Fix typo in error message

ModFile.cc

@@ -144,7 +144,7 @@ ModFile::checkPass(bool nostrict)
   if ((mod_file_struct.ramsey_model_present || mod_file_struct.ramsey_policy_present)
       && mod_file_struct.discretionary_policy_present)
     {
-      cerr << "ERROR: You cannot use the discretionary_policy command when you use either rasmey_model or ramsey_policy and vice versa" << endl;
+      cerr << "ERROR: You cannot use the discretionary_policy command when you use either ramsey_model or ramsey_policy and vice versa" << endl;
       exit(EXIT_FAILURE);
     }