RE: Error uploading SWF files - "Could not load image from string"
Core Version - 5.7.4.2
Version Installed - 5.7.4.2
Database Version - 20150504000000
Theme: Long Story Short (Parallax)

Hi I am new to C5 v5.7 and I have mixed feelings about it. - I am not a coder any way. I am trying to upload some "SWF" files to my file manager, either one by one or in bulk, and it gives me the following error.

gfx_about.swf
Could not load image from string

See debugging message below:

gfx_about.swf
Uncaught exception 'Whoops\Exception\ErrorException' with message 'json_encode(): Invalid UTF-8 sequence in argument' in /home/maduxo/public_html/giovannifx/concrete/src/Error/Handler/JsonErrorHandler.php:48 Stack trace: #0 [internal function]: Whoops\Run->handleError(2, 'json_encode(): ...', '/home/maduxo/pu...', 48, Array) #1 /home/maduxo/public_html/giovannifx/concrete/src/Error/Handler/JsonErrorHandler.php(48): json_encode(Array) #2 /home/maduxo/public_html/giovannifx/concrete/vendor/filp/whoops/src/Whoops/Run.php(248): Concrete\Core\Error\Handler\JsonErrorHandler->handle(Object(Imagine\Exception\RuntimeException)) #3 [internal function]: Whoops\Run->handleException(Object(Imagine\Exception\RuntimeException)) #4 {main} thrown

If anyone has any suggestions I would appreciate your it. Thank you