Error message

Notice: Undefined property: stdClass::$field_taxonomy_name in eval() (line 4 of /home/cityseh0/public_html/click4answer.com/sites/all/modules/views/plugins/views_plugin_argument_default_php.inc(49) : eval()'d code).
Warning: Invalid argument supplied for foreach() in eval() (line 4 of /home/cityseh0/public_html/click4answer.com/sites/all/modules/views/plugins/views_plugin_argument_default_php.inc(49) : eval()'d code).
Notice: Undefined variable: terms in eval() (line 5 of /home/cityseh0/public_html/click4answer.com/sites/all/modules/views/plugins/views_plugin_argument_default_php.inc(49) : eval()'d code).
Warning: implode() [function.implode]: Invalid arguments passed in eval() (line 5 of /home/cityseh0/public_html/click4answer.com/sites/all/modules/views/plugins/views_plugin_argument_default_php.inc(49) : eval()'d code).

what is relationship in views of drupal?

Many time relationship use in view but what does actually it i don't know . anybody help me to explain use & how to use in views of drupal.