so this happens a lot:

[00:01:23]: Mod: workshop-1505270912 ( Tropical Experience Return of Them) Registering default mod prefab
[00:01:23]: Could not preload undefined prefab (ancient_remnant)
[00:01:24]: Could not preload undefined prefab (gold_nugget)
[00:01:24]: Could not preload undefined prefab (dogfishocean_cooked)
[00:01:24]: Could not preload undefined prefab (pugalisk_skull)
[00:01:24]: Could not preload undefined prefab (pugalisk_skull)
[00:01:25]: Could not preload undefined prefab (gold_nugget)
[00:01:25]: Could not preload undefined prefab (gold_nugget)
[00:01:25]: Could not preload undefined prefab (gold_nugget)
[00:01:25]: Could not preload undefined prefab (swordfishjocean_cooked)
[00:01:25]: Could not preload undefined prefab (brokenwall_limestone)
[00:01:26]: Could not preload undefined prefab (ballphinocean_cooked)
[00:01:26]: Could not preload undefined prefab (sandbag_)
[00:01:26]: Could not preload undefined prefab (gold_nugget)
[00:01:26]: Could not preload undefined prefab (sparks_fx)
[00:01:26]: Could not preload undefined prefab (swordfishjocean2_cooked)
[00:01:26]: Could not preload undefined prefab (grounded_wilba)
[00:01:26]: Could not preload undefined prefab (gold_nugget)
[00:01:26]: Could not preload undefined prefab (grounded_wilba)
[00:01:26]: Could not preload undefined prefab (pugalisk_skull)
[00:01:27]: Could not preload undefined prefab (whaleblueocean_cooked)
[00:01:27]: Could not preload undefined prefab (mecfish_cooked)
[00:01:27]: Could not preload undefined prefab (gold_nugget)
[00:01:27]: Could not preload undefined prefab (pugalisk_skull)
[00:01:27]: Could not preload undefined prefab (pugalisk_skull)
[00:01:27]: Could not preload undefined prefab (exitcavelight)
[00:01:27]: Could not preload undefined prefab (gold_nugget)
[00:01:27]: Could not preload undefined prefab (gold_nugget)
[00:01:27]: Could not preload undefined prefab (goldfish_cooked)
[00:01:27]: Could not preload undefined prefab (exitcavelight)
[00:01:27]: Could not preload undefined prefab (sharxocean_cooked)

then the whole server log is filled with this one:
could not find anim build FROMNUM

should I worry? happens with the volcanic mod