Mplus Warings

[Conmon1993]

I do not know how to fix this. It would be highly appreciated if you could offer any advice.
THE MODEL ESTIMATION DID NOT TERMINATE NORMALLY DUE TO AN ILL-CONDITIONED
FISHER INFORMATION MATRIX. CHANGE YOUR MODEL AND/OR STARTING VALUES.

 THE MODEL ESTIMATION DID NOT TERMINATE NORMALLY DUE TO A NON-POSITIVE
 DEFINITE FISHER INFORMATION MATRIX.  THIS MAY BE DUE TO THE STARTING VALUES
 BUT MAY ALSO BE AN INDICATION OF MODEL NONIDENTIFICATION.  THE CONDITION
 NUMBER IS      -0.854D-12.

 THE STANDARD ERRORS OF THE MODEL PARAMETER ESTIMATES COULD NOT BE
 COMPUTED.  THIS IS OFTEN DUE TO THE STARTING VALUES BUT MAY ALSO BE
 AN INDICATION OF MODEL NONIDENTIFICATION.  CHANGE YOUR MODEL AND/OR
 STARTING VALUES.  PROBLEM INVOLVING PARAMETER 9.

[Conmon1993]

help~~~