The OpenLogFunctions class is already included in the classHistory library which is also used in the sf_sys_FieldChangeHistory subform which causes a runtime error when trying to execute Set g_history = New History("fHistory") in the post open event of sf_sys_FieldChangeHistory (Cannot find external reference G_HISTORY).



I removed the Use "OpenLogFunctions" option in sf_sys_FieldChangeHistory and it resolved the issue.