错误提示是
ERROR: User function for VARIABLE model_1.SPRING_1.force has been incorrectly specified.
Function FX in the FUNCTION = expression refers to a non-existent
force element. No TRANSLATIONAL force is defined
between markers MARKER model_1.PART_2.MARKER_7 and MARKER model_1.PART_3.MARKER_8.
ERROR: User function for VARIABLE model_1.SPRING_1.force has been incorrectly specified.
Function FY in the FUNCTION = expression refers to a non-existent
force element. No TRANSLATIONAL force is defined
between markers MARKER model_1.PART_2.MARKER_7 and MARKER model_1.PART_3.MARKER_8.
ERROR: User function for VARIABLE model_1.SPRING_1.force has been incorrectly specified.
Function FZ in the FUNCTION = expression refers to a non-existent
force element. No TRANSLATIONAL force is defined
between markers MARKER model_1.PART_2.MARKER_7 and MARKER model_1.PART_3.MARKER_8.