def build(self, lv2_uri):
try:<EOL><INDENT>plugin = self._plugins[lv2_uri]<EOL><DEDENT>except KeyError:<EOL><INDENT>raise Lv2EffectBuilderError(<EOL>"<STR_LIT>"<EOL>"<STR_LIT>"<EOL>"<STR_LIT>".format(lv2_uri))<EOL><DEDENT>return Lv2Effect(plugin)<EOL>
Returns a new :class:`.Lv2Effect` by the valid lv2_uri

:param string lv2_uri:
:return Lv2Effect: Effect created