I am running CFA, i got the message that THE LATENT VARIABLE COVARIANCE MATRIX (PSI) IS NOT POSITIVE DEFINITE. THIS COULD INDICATE A NEGATIVE VARIANCE/RESIDUAL VARIANCE FOR A LATENT VARIABLE, A CORRELATION GREATER OR EQUAL TO ONE BETWEEN TWO LATENT VARIABLES. i also found the that THE SAMPLE CORRELATION OF Y2 AND Y1 IS -1.000
How can i sort this out, do i have to write a certain command? please advise.