[Nutch Wiki] Trivial Update of "PluginGotchas" by LewisJohnMcgibbney

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The "PluginGotchas" page has been changed by LewisJohnMcgibbney:
http://wiki.apache.org/nutch/PluginGotchas

New page:
PluginGotchas is an attempt to create a repository for identified problems which have been overcome through discussion on the Apache Nutch mailing lists.

=== Problem compiling custom plugins ===

Discussion on this issue can be seen in context [[http://www.mail-archive.com/user%40nutch.apache.org/msg03257.html|here]]

When building a plugin with Ant E.g.

{{{
moliere@blitz:~/java/apache-nutch-1.3/src/plugin/recommended$ ant
}}}

The following was logged to stdout

{{{
Buildfile: build.xml

BUILD FAILED
/home/moliere/java/apache-nutch-1.3/src/plugin/recommended/build.xml:5:
The following error occurred while executing this line:
/home/moliere/java/apache-nutch-1.3/src/plugin/build-plugin.xml:46:
Problem: failed to create task or type
antlib:org.apache.ivy.ant:settings
Cause: The name is undefined.
Action: Check the spelling.
Action: Check that any custom tasks/types have been declared.
Action: Check that any <presetdef>/<macrodef> declarations have taken place.
No types or tasks have been defined in this namespace yet
Total time: 0 seconds
}}}

In more detail, this specifically relates to...