[R] problem in run cmsaf script

[Nooshin Ahmadi]

Hi
I work with cmsaf package and have a script for prepare data in R.
I run this script and have some error like this:Error in if (startdate < dates[1]) (dums <- 1) : 
  missing value where TRUE/FALSE needed
In addition: Warning messages:
1: running command 'tar.exe -tf "D:/CM SAF/ORD24552.tar"' had status 2 
2: In eval(ei, envir) : NAs introduced by coercion
3: In eval(ei, envir) : NAs introduced by coercion
4: In eval(ei, envir) : NAs introduced by coercion
5: running command 'tar.exe -tf "D:/CM SAF/ORD24552.tar"' had status 2 
6: In eval(ei, envir) : NAs introduced by coercion

I dont know how to solve this problem.Can you help me? 
I attached this script.

Best Regards
Nooshin