Unable to record video with RPi-Cam-Web-Interface with USB mounted

[/RaspberryPi]

I am trying to record a video using RPi-Cam-Web-Interface on my raspberry pi model 3b+ and saving it on my thumb-drive.
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However, when trying to record a video with my thumb-drive mounted to /var/www/html/media it gives me an error ```mmal: mmal_port_disable: port vc.ril.video_encode:out:0(H264)(0x1234300) is not enabled```
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I tried changing ``` gpu_mem=192``` in /boot/config.txt and rebooting the raspberry pi but it still is giving me the error ```mmal: mmal_port_disable```

submitted by /u/Ordinary_Sound_1386
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