[R] what does this error mean?

[szhan@uoguelph.ca]

Dear R-users:
I am runing R 1.6.2 with Windows XP. I try to calculate Pearson correlation 
and Spearman correlation of any pairwise columns of 8000 x 80 data matrix with 
missing values and randomize the matix 1000 times and calculate this two 
correlations again. The code bellow for Pearson is working fine but for 
Spearman got the error bellow for randomized data matrix and R console is stop 
working: 

cor (raw2[,i], raw2[,j], use="complete.obs")
cor.test (raw2[,i], raw2[,j],  method="spearman", na.action = "na.omit")
$estimate

Error in cor.test.default(raw2[, i], raw2[, j], method = "spearman", na.action 
= "na.omit") : 
        not enough finite observations
In addition: There were 50 or more warnings (use warnings() to see the first 
50)

What does the Error mean? How to fix it?
Any suggestion are highly appreciated?
Josh