system index out of range exception: Cannot find table 0
I have website and from my website admin console there is an option to upload csv file. Once you click on submit button the data will be loaded into my database.but now i am facing an issue while uploading csv file. It is showing error message : server error in '/' Application. Cannot find table 0. if i am uploading excel file then it is showing different error. please let me know the solution to resolve the issue. screenshot attached for reference.