[R] Problem detect cheating with CopyDetect Package

[Ahmad Nursalim]

Dear All list members,
Please Help me
I have the problem detect cheating analysis with use of CopyDetect Package
I use my own data
namely data.abcd and slopintrc
and when I tried to count by R studio with a script

for (i in 1: replication) {

   x <- CopyDetect2 (data = data.abcd,
                    item.par = slopintrc,
                    pair = c (pairs [i, 1], pairs [i, 2]),
                    options = c ("A", "B", "C", "D", "E"))

   pairs [i,] $ W = x $ W.index $ p.value
   pairs [i,] $ GBT = x $ GBT.index $ p.value
   pairs [i,] $ K = x $ K.index $ k.index
   pairs [i,] $ K1 = x $ K.variants $ K1.index
   pairs [i,] $ K2 = x $ K.variants $ K2.index
   pairs [i,] $ S1 = x $ K.variants $ S1.index
   pairs [i,] $ S2 = x $ K.variants $ S2.index
}

an error

Error in solve.default(object$hessian) :
  system is computationally singular: reciprocal condition number =
2.52915e-29In addition: Warning message:In ltm.fit(X, betas,
constraint, formula, con) :
  Hessian matrix at convergence is not positive definite; unstable solution.

Please help me
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