Problems of adding ExternalForce to a model

[XIAODONG HE]

I added an external force containing a time-varying ground reaction force file to a model. But when I opened this model in OpenSim 3.3 GUI or loaded it in MATLAB, the software crashed. This my <ExternalForce> under <ForceSet>:

<ExternalForce>
<!--Name of the body the force is applied to.-->
<applied_to_body>calcn_r</applied_to_body>
<!--Name of the body the force is expressed in (default is ground).-->
<force_expressed_in_body>ground</force_expressed_in_body>
<!--Name of the body the point is expressed in (default is ground).-->
<point_expressed_in_body>ground</point_expressed_in_body>
<!--Identifier (string) to locate the force to be applied in the data source.-->
<force_identifier>ground_force_v</force_identifier>
<!--Identifier (string) to locate the point to be applied in the data source.-->
<point_identifier>ground_force_p</point_identifier>
<!--Identifier (string) to locate the torque to be applied in the data source.-->
<torque_identifier>ground_torque_</torque_identifier>
<!--Name of the data source (Storage) that will supply the force data.-->
<data_source_name>HKS014_OGFL01_grf_extratime_right_only.mot</data_source_name>
</ExternalForce>

I also attached my model and the ground reaction force file. Many thanks if someone can help me out.