error: internal verification failure, sorry! {PrepAndWrite() called on non-diskcacheable stuff}

Hi, I had that error as well when rendering a specific project.. The cause of the problem seemed to be broken expressions as someone mentioned above^^:) I'd suggest you turn on the error log and go through your comps if you see this error again. It worked for me! 

same

Same here... help

I'm having the same issue. All my permissions seem fine. I'm able to eventually finish rendering the compositions, and whatever is going wrong seems to recover. 

For example, I set up a queue to render last night:
I had 9 compositions, using 2 different templates with master properties set from imported .csv files.

Template 1: Both renders completed, but the log for each has multiple instances (well over fifty each) of this error, before completing, with no other errors.  Rendered files appear to be ok.

Template 2: The first copy renders, and the log also has this error, but only 18 copies of the error message. The remaining instances render without error, but averaged 40 minutes each to render. All compositions finished rendering, and appear to be ok.

For a check, I re-rendered one of the Template 1 compositions and this time got "only" 30 logged copies of the error, and the composition completed.

The exact text of the error is:

After Effects error: internal verification failure, sorry! {PrepAndWrite() called on non-diskcacheable stuff}

I am running After Effects 17.5.0 Catalina 10.15.7 (19H15) on:
Mac Pro (2019)

3.2 GHz 16-Core Intel Xeon W

160 GB 2933 MHz DDR4

AMD Radeon Pro Vega II 32 GB
4TB SSD internal for output

4TB SSD external for caching

4TB secure SSD for project files