I am new to houdini and this is a simple setup. I have a flip tank with object colliding with it. I simply went inside the fliptank_fluid node and attached an ROP Output driver to the Render node. When I click “save to disk” (render in old versions) it starts cooking and when it gets to 100% for the first frame it just stops and theres an error on the ROP Output node that reads “cook error in input” please someone help.

i used to do this fine and this method worked, only recently it stopped by the way

maybe if you supply the file?