diff --git a/app/views/admin/olympiamanagements/_import_schoo_class_setting.xlsx.axlsx b/app/views/admin/olympiamanagements/_import_schoo_class_setting.xlsx.axlsx
index 7e3da27..cfa641f 100644
--- a/app/views/admin/olympiamanagements/_import_schoo_class_setting.xlsx.axlsx
+++ b/app/views/admin/olympiamanagements/_import_schoo_class_setting.xlsx.axlsx
@@ -14,14 +14,14 @@ wb.add_worksheet(name: "school_class") do |sheet|
   @OlympiaSchoolDataFields.each do |school_data_field|
 	temp_row = []
 	@fields.each do |field_key|
-		temp_row << (school_data_field[field_key] rescue '')
+		temp_row << (school_data_field[field_key].to_s rescue '')
 	end
 	export_data_rows << temp_row
   end
   
   #export data end
-  sheet.add_row row , :style=> title,:widths => row.map{|cell| (cell.length* 11/ 2).round}
+  sheet.add_row row , :style=> title,:widths => row.map{|cell| (cell.length* 11/ 2).round} , :types => :string
   export_data_rows.each do |infos_row|
-	sheet.add_row infos_row , :style=> column
+	sheet.add_row infos_row , :style=> column , :types => :string
   end
 end
\ No newline at end of file
diff --git a/app/views/admin/olympiamanagements/_school_export.xlsx.axlsx b/app/views/admin/olympiamanagements/_school_export.xlsx.axlsx
index 2292765..0aa8461 100644
--- a/app/views/admin/olympiamanagements/_school_export.xlsx.axlsx
+++ b/app/views/admin/olympiamanagements/_school_export.xlsx.axlsx
@@ -14,14 +14,14 @@ wb.add_worksheet(name: "school_class") do |sheet|
   @OlympiaSchoolDataFields.each do |school_data_field|
 	temp_row = []
 	@fields.each do |field_key|
-		temp_row << (school_data_field[field_key] rescue '')
+		temp_row << (school_data_field[field_key].to_s rescue '')
 	end
 	export_data_rows << temp_row
   end
   
   #export data end
-  sheet.add_row row , :style=> title,:widths => row.map{|cell| (cell.length* 11/ 2).round}
+  sheet.add_row row , :style=> title,:widths => row.map{|cell| (cell.length* 11/ 2).round} , :types => :string
   export_data_rows.each do |infos_row|
-	sheet.add_row infos_row , :style=> column
+	sheet.add_row infos_row , :style=> column , :types => :string
   end
 end
\ No newline at end of file