Continued to check the cause of the error encountered in my local when executing the web application, request assistance with Nate as many solutions applied the error is still encountered, as checking and executing the command, found out that the cause of the error is the route, as Nate there might be changes in the config made in the web application. The execution of the web application is now OK on my side, check the cause of the error encountered by the user, the file can't be uploaded, as per checking, the cause of the error is the sheet name. There is a condition in the web application that checks the sheet name, the sheet name should be "Top Sheet" if this is not met the web application will not do anything thus it will return an error, undefined variable fileId because it is declared inside the condition, the condition is not met, thus the fileId variable is not declared and has no value.