Error Log should i be worried?

Hi,



I usually check my error log every Month or in some cases if i think there is an issue with the server i check it every week.



Well this month I have been seeing a lot of this.

Code:

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[Sat Jan 03 00:18:54 2015] [error] [client xxx.xxx.xxx.xx] File does not exist: /home/user/domains/http://ift.tt/1Dfg8QC, referer: http://ift.tt/1EZs5i0

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Should I be worried?

Error Log should i be worried?