errors while using dwepcrack

Hi,

The following error messages are getting displayed when i tried to use the 
'dwepcrack does' command to crack the wep key in freebsd.

1. the logfile cannot be opened.
2. output file format is not pcap.

I tried to find the solution to clear these errors but haven't got them 
cleared. If anyone can suggest me something that can clear these errors that 
would be great. Thanks

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