fix bug in equil options

MBsysC/mbs_interface/MBsysPy/mbsyspy/mbs_dirdyn.py

@@ -852,7 +852,7 @@ class MbsDirdyn(object):
 
             except AttributeError as err:
                 # if error during cast of strings (i.e in str_to_bytes)
-                raise TypeError("{:} is str, {:} can not be casted.".format(key, type(value))).with_traceback(err.__traceback__) from None
+                raise TypeError("{:} is str, can not be casted from {:}".format(key, type(value))).with_traceback(err.__traceback__) from None
 
             except TypeError as err:
                 # if wrong type in integrator or compute_QC

MBsysC/mbs_interface/MBsysPy/mbsyspy/mbs_equil.py

@@ -940,12 +940,12 @@ class MbsEquil(object):
                 if key == 'store_results':
                     self.store_results = int(value)
                 else:
-                    setattr(self.mbs_part_ptr.contents.options.contents, c_name, options[key]['convert'](value))
+                    setattr(self.mbs_equil_ptr.contents.options.contents, c_name, options[key]['convert'](value))
             except ValueError as err:
                 raise TypeError("{:} is {:}, can not be casted from {:}.".format(key, options[key]['convert'], type(value))).with_traceback(err.__traceback__) from None
             except AttributeError as err:
                 # if error during cast of strings (i.e in str_to_bytes)
-                raise TypeError("{:} is str, {:} can not be casted.".format(key, type(value))).with_traceback(err.__traceback__) from None
+                raise TypeError("{:} is str, can not be casted from {:}.".format(key, type(value))).with_traceback(err.__traceback__) from None
 
     def get_options(self, *args):
         """