用mplus运行了PROCESS模型8，潜变量。
结果有一段提示：

THE STANDARD ERRORS OF THE MODEL PARAMETER ESTIMATES MAY NOT BE
     TRUSTWORTHY FOR SOME PARAMETERS DUE TO A NON-POSITIVE DEFINITE
     FIRST-ORDER DERIVATIVE PRODUCT MATRIX.  THIS MAY BE DUE TO THE STARTING
     VALUES BUT MAY ALSO BE AN INDICATION OF MODEL NONIDENTIFICATION.  THE
     CONDITION NUMBER IS      -0.707D-18.  PROBLEM INVOLVING THE FOLLOWING PARAMETER:
     Parameter 45, [ OPT ]

请问这个怎么处理？