Not able to upload .xlsx file using excel importer

Hi All, I have upgraded my modeler to 6.7.1 latest version and also upgraded the excel importer module to the latest version two months ago. I was able to upload .xls file successfuly but  I was not able to upload .xlsx file. I again upgraded to the latest version but getting the same issue. getting the following error - File format is incorrect. Please ensure that there are no formulae or calculated cells. Additionally -  access denied ("java.util.PropertyPermission" "org.xml.sax.driver" "read")   I have seen in the .security file of modeler, the access is correct. Can somebody please let me know how i can handle this error ?  
1 answers

is emulate cloud security turned on? Try settings the emulate cloud security to no and try again.