erro on php log error

[Jm0u]

2014-01-29 15:47:47 Notice(8): unserialize(): Error at offset 0 of 2 bytes Backtrace : /usr/local/itsupport/plugins/monitoring/inc/servicegraph.class.php:1302 unserialize() /usr/local/itsupport/plugins/monitoring/ajax/updateChart.php:98 PluginMonitoringServicegraph::loadPreferences()

2014-01-29 15:47:47 Warning(2): Invalid argument supplied for foreach() Backtrace : /usr/local/itsupport/plugins/monitoring/inc/servicegraph.class.php:1303 Toolbox::userErrorHandlerNormal() /usr/local/itsupport/plugins/monitoring/ajax/updateChart.php:98 PluginMonitoringServicegraph::loadPreferences()

2014-01-29 15:47:47 Notice(8): unserialize(): Error at offset 0 of 2 bytes Backtrace : /usr/local/itsupport/plugins/monitoring/inc/servicegraph.class.php:1309 unserialize() /usr/local/itsupport/plugins/monitoring/ajax/updateChart.php:98 PluginMonitoringServicegraph::loadPreferences()

2014-01-29 15:47:47 Warning(2): Invalid argument supplied for foreach() Backtrace : /usr/local/itsupport/plugins/monitoring/inc/servicegraph.class.php:1310 Toolbox::userErrorHandlerNormal() /usr/local/itsupport/plugins/monitoring/ajax/updateChart.php:98 PluginMonitoringServicegraph::loadPreferences()

2014-01-29 15:47:48 Warning(2): Invalid argument supplied for foreach() Backtrace : /usr/local/itsupport/plugins/monitoring/inc/servicegraph.class.php:1303 Toolbox::userErrorHandlerNormal() /usr/local/itsupport/plugins/monitoring/ajax/updateChart.php:98 PluginMonitoringServicegraph::loadPreferences()

2014-01-29 15:47:48 Warning(2): Invalid argument supplied for foreach() Backtrace : /usr/local/itsupport/plugins/monitoring/inc/servicegraph.class.php:1310 Toolbox::userErrorHandlerNormal() /usr/local/itsupport/plugins/monitoring/ajax/updateChart.php:98 PluginMonitoringServicegraph::loadPreferences()