diff --git a/src/zcl_excel_reader_2007.clas.abap b/src/zcl_excel_reader_2007.clas.abap
index 92f023a..0f8c24d 100644
--- a/src/zcl_excel_reader_2007.clas.abap
+++ b/src/zcl_excel_reader_2007.clas.abap
@@ -270,7 +270,9 @@ private section.
     importing
       !I_FILENAME type CSEQUENCE
     returning
-      value(R_EXCEL_DATA) type XSTRING .
+      value(R_EXCEL_DATA) type XSTRING 
+    raising
+      ZCX_EXCEL.
   methods READ_FROM_LOCAL_FILE
     importing
       !I_FILENAME type CSEQUENCE