Render fail because of cross dissolve

I have a small video for displaying stills involving 4 Fusion compositions, the first 3 of which are almost identical with just media input and text changes. The media inputs are stills (jpegs). The fourth composition is slightly different as it involves a short lens flare video with a still of a logo (transparent png file) overlaid.

If I render these as they stand, it all works fine. But then I wanted to smooth out the transitions between the compositions and added a cross-dissolve transition to the compositions on the edit page. The ones between the fusion compositions that are almost identical work fine, but if I add a cross-dissolve between the third and fourth, even though it appears to work fine in preview, Resolve always throws up a 'Render job failed as the current clip could not be pcessed: The Fusion composition on the current frame or clip could not be processed successfully' error when I try to render them all just at the point where the render meets the fourth compostion. If I remove the cross dissolve between the 3rd and 4th composition, it will render without errors.

Does anyone know why this might be and what I can do to get round it?

Try going to Preferences>User>UI Settings and unchecking the last Stop renders option.

But then, you’ll be just covering up the problem and may see stuttering in the output.
You may get away with it, but if it’s based on hardware limitations, separating rendering and H.264 encoding (if you are using that) might be a better solution.
Finally, how large are your JPEGs? If you don’t zoom, scaling them to the size of your final renders outside of DR might help.

...I wanted to smooth out the transitions between the compositions and added a cross-dissolve transition to the compositions on the edit page. The ones between the fusion compositions that are almost identical work fine, but if I add a cross-dissolve between the third and fourth, even though it appears to work fine in preview, Resolve always throws up a 'Render job failed as the current clip could not be pcessed...

This may or may not be the issue, but it's worth checking... A common error when using transitions is a failure to provide long enough handles on the clips being transitioned. A "handle" is the extra footage before the "In" point of a clip or after the "Out" point of a clip.

In a transition, you need frames in the incoming clip before the actual clip boundary and you need frames in the outgoing clip after the clip boundary - this is because the transition uses images from both clips through the entire duration of the transition. For example, in a cross dissolve the incoming clip's images are being faded in to start blending with the outgoing clip even before the playhead reaches the "In" point of the incoming clip.

If you've cut a clip too close to the beginning or the end, or if you haven't included enough extra frames to cover the length of the transition when creating your Fusion composition, the transition may not have the frames it needs to work.

If adding the transition causes a failure, this is something to check.

Thanks, that worked.

Could you tell me why that option exists if it works just fine without it?