inp文件引入接触出错，请问是什么原因？ 20

错误信息：

*CONTACT PROPERTY ASSIGNMENT CAN ONLY REFERENCE SURFACE INTERACTIONS WHICH ARE DEFINED AS MODEL DATA.  SEE THE SURFACE INTERACTION NAMED INTPROP-1.

inp文件：

*Heading
** Job name: Job-1 Model name: Model-1
** Generated by: Abaqus/CAE 2016
*Preprint, echo=NO, model=NO, history=NO, contact=NO
**
** PARTS
**
*Part, name=Part-1
*Node
      1,           0.,           0.,           0.
*Nset, nset=Set-1, generate
 1,  1,  1
*Element, type=PD3D, elset=Set-1_Inertia-1_
1, 1
*DISCRETE SECTION, elset=Set-1_Inertia-1_,DENSITY=2000,ALPHA=0
0.2
*DISCRETE ELASTICITY
200E12,0.3
*SURFACE,NAME=face1,TYPE=ELEMENT
1,
*End Part
** 
*Part, name=Part-2
*Node
...
*Element, type=R3D4
...
*Node
     67, -0.0399999991, -0.0199999996,           0.
*Nset, nset=Part-2-RefPt_, internal
67,
*Elset, elset=Part-2, generate
  1,  50,   1
*End Part
** 
**
** ASSEMBLY
**
*Assembly, name=Assembly
** 
*Instance, name=Part-1-1, part=Part-1
*End Instance
** 
*Instance, name=Part-2-1, part=Part-2
 -1.38777878078145e-17,        -0.02,         0.02
 -1.38777878078145e-17,        -0.02,         0.02,           1.,        -0.02,         0.02,          90.
*End Instance
** 
*Nset, nset=Set-1, instance=Part-2-1, generate
  1,  66,   1
*Elset, elset=Set-1, instance=Part-2-1, generate
  1,  50,   1
*Rigid Body, ref node=Part-2-1.Part-2-RefPt_, elset=Part-2-1.Part-2
*End Assembly
**
**
** BOUNDARY CONDITIONS
**
** Name: BC-1 Type: Symmetry/Antisymmetry/Encastre
*Boundary
Set-1, ENCASTRE
**
** PREDEFINED FIELDS
**
** Name: Predefined Field-1   Type: Velocity
*Initial Conditions, type=VELOCITY
Part-1-1.Set-1, 1, 0.
Part-1-1.Set-1, 2, -0.1
Part-1-1.Set-1, 3, 0.
** ----------------------------------------------------------------
**
** STEP: Step-1
**
*Step, name=Step-1, nlgeom=YES
*Dynamic, Explicit
, 1.
*Bulk Viscosity
0.06, 1.2
**
*SURFACE INTERACTION,NAME=IntProp-1
*SURFACE BEHAVIOR,PRESSURE-OVERCLOSURE=Hertz
9e13
*Contact, op=NEW
*Contact Inclusions, ALL EXTERIOR
*Contact Property Assignment
 ,  , IntProp-1
** OUTPUT REQUESTS
**
*Restart, write, number interval=1, time marks=NO
**
** FIELD OUTPUT: F-Output-1
**
*Output, field, variable=PRESELECT
**
** HISTORY OUTPUT: H-Output-1
**
*Output, history, variable=PRESELECT
*End Step