Background rendering issue

I have recently begun using After Effects, and have been facing an issue.
I've been tasked with using Lottie Files to export and test animations. However, when I use the Bodymovin plugin to render an animation and save it as a JSON file, the background of my animation appears transparent instead of showing the actual gradient of solid colors that it has. I've attempted various solutions to address this problem, but I haven't been able to find the correct approach.