Sequencer problem

Hi, everyone. Thank you for your attention. I have a small question to ask out because I never experience this before. I try to render the shot from sequencer, and it works well everytime, but today once I try to render out it shows that “Read Only” and nothing happens. I wonder that I set something wrong or it is 4.26 bug. Thank you.

Maybe try choosing another path?

Also, we’ll eventually be phasing out this render movie tool in favor of the new Movie Render Queue. That button in Sequencer will eventually invoke that tool. So, maybe try it out?