How to fix the error HttpInterface Failed to load libcurl from the Web-Mon plug-in?

The Web-Mon plugin fails to monitor desired URL.

From the Netprobe log, there is below error:

WARN: HttpInterface Failed to load libcurl [Could not load libcurl: libcurl.so: cannot open shared object file: No such file or directory].  Please check your LD_LIBRARY_PATH. Some HTTP features will not be available.  See any furter messages for details.