where did you download firedl? from Amazon or another site.? I had same problem and uninstalled and reinstalled the version from amazon and it was fine after that
Is your firedl version 0.15 also firedl has been having some problems over the last couple of days, if you have Downloader you can get`em from there with a URL
Tested and working>>Terrarium TV 1.9.10 Ad Free Firedl - 644552
MX Player Pro v1.9.24 Neon mod-lite Firedl - 773633
VLC v3.0.5-32bit Firedl - 880311