Invalid File Path When Importing Targets Error

We recently upgraded from Sugar 8.0.2 to 9.0.2. We have started to notice a new error when importing targets. Whenever you change the field mapping during the import the screen turns white after clicking import targets. We checked our error logs and found the message below. Does anyone know of a permanent solution for this? In the mean time we are just fixing the import file headings to they map automatically when importing.

Sugar Version: Professional 9.0.2

Exception in Controller: Sugarcrm\Sugarcrm\Security\InputValidation\Exception\ViolationException: Invalid file path in /var/www/html/sugar/modules/Import/sources/ImportFile.php:103
Stack trace:
#0 /var/www/html/sugar/modules/Import/views/view.last.php(157): ImportFile->__construct('upload://import...', ',', '"', false, false)
#1 /var/www/html/sugar/modules/Import/views/view.last.php(114): ImportViewLast->getListViewTableFromFile('upload://import...', 'dup')
#2 /var/www/html/sugar/include/MVC/View/SugarView.php(153): ImportViewLast->display(Array)
#3 /var/www/html/sugar/include/MVC/Controller/SugarController.php(350): SugarView->process(Array)
#4 /var/www/html/sugar/include/MVC/Controller/SugarController.php(298): SugarController->processView()
#5 /var/www/html/sugar/include/MVC/SugarApplication.php(199): SugarController->execute()
#6 /var/www/html/sugar/index.php(27): SugarApplication->execute()
#7 {main}

Thanks,

Dan