[SOLVED] getTemplateVarOutput in Plugin causing bad SQL call

$modx->getTemplateVarOutput('myTV');

version for the right syntax to use near '' at line 1 »
      SQL: SELECT tv.*, IF(tvc.value!='',tvc.value,tv.default_text)
as value FROM `topvicto_modx`.`modx_site_tmplvars` tv INNER JOIN `topvicto_modx`.
`modx_site_tmplvar_templates` tvtpl ON tvtpl.tmplvarid = tv.id LEFT JOIN `topvicto_modx`.
`modx_site_tmplvar_contentvalues` tvc ON tvc.tmplvarid=tv.id AND tvc.contentid = ''
 WHERE tv.name IN ('myTV') AND tvtpl.templateid = 

$modx->getTemplateVarOutput(array('myTV'));

 WHERE tv.name IN ('myTV')