FTL Stack trace for xmas tree document

// [INFO] [talledLocalContainer] FTL stack trace ("~" means nesting-related):[INFO] [talledLocalContainer] FTL stack trace ("~" means nesting-related):[INFO] [talledLocalContainer]  - Failed at: @hst.html hippohtml=interview  [in template "jcr:/webfiles/site/freemarker/hap/xmas-tree/main.ftl" in macro "employee" at line 51, column 15][INFO] [talledLocalContainer]  - Reached through: @employee "Employee", semployee  [in template "jcr:/webfiles/site/freemarker/hap/xmas-tree/main.ftl" at line 163, column 11][INFO] [talledLocalContainer] ----. To see the stack trace, set 'org.hippoecm.hst.servlet.HstFreemarkerServlet' log-level to debug in log4j configuration or runtime via the logging servlet[WARNING] [talledLocalContainer] %d{HH:mm:ss} WARN  [HstFreemarkerServlet] Failed to set JSP tag parameter "hippohtml" (declared type: org.hippoecm.hst.content.beans.standard.HippoHtml, actual value's type: com.onehippo.cms.beans.Employee$Employee$OL06NLej). See cause exception for the more specific cause...[INFO] [talledLocalContainer][INFO] [talledLocalContainer] ----[INFO] [talledLocalContainer] FTL stack trace ("~" means nesting-related):[INFO] [talledLocalContainer]  - Failed at: @hst.html hippohtml=interview  [in template "jcr:/webfiles/site/freemarker/hap/xmas-tree/main.ftl" in macro "employee" at line 51, column 15][INFO] [talledLocalContainer]  - Reached through: @employee "Employee", semployee  [in template "jcr:/webfiles/site/freemarker/hap/xmas-tree/main.ftl" at line 163, column 11][INFO] [talledLocalContainer] ----. To see the stack trace, set 'org.hippoecm.hst.servlet.HstFreemarkerServlet' log-level to debug in log4j configuration or runtime via the logging servlet[WARNING] [talledLocalContainer] %d{HH:mm:ss} WARN  [HstFreemarkerServlet] Failed to set JSP tag parameter "hippohtml" (declared type: org.hippoecm.hst.content.beans.standard.HippoHtml, actual value's type: com.onehippo.cms.beans.RealEstate$Realestate$5yBhsq1B). See cause exception for the more specific cause...