if uploading an image (front- and back-end) I get the message 'file type is not allowed'. If saving the entry then results in,

500 Cannot save fields data. Cannot crop image: Cannot get info about given image. File /tmp/filesc07b78909eb49969698ae7458f86903e/048249aa22311a21d86fdc65e85a97dd/DSC03489.JPG may not be an image or is named improperly. Check the file type and try again... in