R help - Jun 2009 - Asking for help while using "Simplex" to solve LP Problem.

Hello. I am a new user and want to use R to solve Linear Programming problem. I
met a problem while using function "Simplex" and I would kindly ask
whether someone could help to figure it out.

In my problem, there are 47 parameters and all limited to (0,1). M file has 147
lines and P file has 100 line. Each line in M indicated following inequality:
V1>=V2*X1+V3*X2+V4*X3+...+V48*X47, where the top 47 lines 1>=Xi (i=1 to
47) . Each line in P indicated inequality: V1<=V2*X1+V3*X2+V4*X3+...+V48*X47
The object function is (1,0,0...0) as I want to know the range of first
parameter.
So I wrote statements as following:

enj<-c(1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0)
P<-as.matrix(read.table("P",header=FALSE,sep="\t"));
M<-as.matrix(read.table("M",header=FALSE,sep="\t"));
simplex(a=enj,A1=M[,2:48],b1=t(M[,1]),A2=P[,2:48],b2=t(P[,1]),maxi=TRUE)

Then I got the error message:
Error in while (!all(obfun > -eps) && (it <= n.iter)) { :
  missing value where TRUE/FALSE needed

Is anybody knows how to fix the error? Thank you.

Cheers.
Shubin Ren