The method getDefaultUrl() does not exist on Settings_Vtiger_Module_Model. It seems like you code against a sub-type of Settings_Vtiger_Module_Model such as Settings_SlaPolicy_Module_Model or Settings_Profiles_Module_Model or Settings_Roles_Module_Model or Settings_Magento_Module_Model or Settings_Companies_Module_Model or Settings_PickListDependency_Module_Model or Settings_Mail_Module_Model or Settings_MeetingServices_Module_Model or Settings_BusinessHours_Module_Model or Settings_Workflows_Module_Model or Settings_AutomaticAssignment_Module_Model or Settings_WooCommerce_Module_Model or Settings_MailSmtp_Module_Model or Settings_FieldsDependency_Module_Model or Settings_MailSignature_Module_Model or Settings_Wapro_Module_Model or Settings_AdvancedPermission_Module_Model or Settings_LoginHistory_Module_Model or Settings_PDF_Module_Model or Settings_Groups_Module_Model or Settings_MailServers_Module_Model.
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Ignorable by Annotation
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If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation