tail -f c:\file.log" | sed -n -e "/error/p" -not working

Nush Pera nushp@usa.net
Fri Jan 5 01:31:00 GMT 2001

When I use the command:

tail -f c:\file.log | sed -n -e "/error/p" 

for see if exist some "error" in the last lines of log file c:\file.log 
it doesn't work. 
If I use 

tail -10 c:\file.log | sed -n -e "/error/p" 

this work but I'm interested to see if the last line it is with "error" text
and when it is I want to execute an exe file.
How do I do that?

Thanks a lot !  

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