求高手指点adams中 akispl函数错误

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语句：-AKISPL(DM(MARKER_8,CM)-400,0,spline_1,0)

错误提示：
ERROR:   The function expression indicated contains at least one error.
ERROR:   Description   : The object referenced is not in the model.
ERROR:   
ERROR:   Function text : "-AKISPL(DM(MARKER_8,CM)-400,0,spline_1[[,]]0)"
ERROR:                   (The element at or immediately after the error is
ERROR:                    enclosed in double brackets '[[' and ']]'.)
ERROR:


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