Ugdhar

A good rule of thumb, any website that throws a random number in front of a product name is probably shifty

What folder are you choosing as your workspace when you load into eclipse? Just curious, since I see that message about overlapping.

Not sure if it's related to your issue, but I would remove optifine from the server, since optifine is a client mod for increasing performance. After that, I see an error about bloodmagic, maybe try updating that and/or forge to the most current/recommended versions.

If you need help finding logs, the EAQ has info on finding them:

It looks like perhaps you are trying to use a 1.14.4 version of the replaymod with 1.13.2 Remove the mod, update it, or install forge for 1.14.4 and update your installation, and see if that helps.

What happens if you try more than 5 mods? Please post logs to show us what happens.

The only mod I see referenced in this log is speedy hoppers, if you remove that mod, does it still crash? also, where did you download mods from? I would only download them from Curseforge, if you downloaded them from shady websites like 9minecraft, delete them immediately and redownload them from curseforge. See https://stopmodreposts.org/ for more information on why this is bad. If you got your mods from a legit source, and it still crashes after removing speedy hoppers, post the new crash.

Make sure you read the instructions for mods you use, I'm pretty sure you're not using the correct forge version as stated on the pixelmon website.

Moderators will tell you the same thing. And if you've got the same problem, then post your screenshot of the updated launcher as DaemonUmbra asked the OP.

You should create your own topic, and post logs/screenshots so people can attempt to accurately diagnose the issue.

Update to the most recent launcher

I believe Fluids are still being worked on, but when they're working I believe there's going to be a recommended build for 1.14.4.

You probably need to create a new installation in the launcher ("Installations" at the top next to where it says "Play"), and choose the version of forge you just installed. Make sure when you're picking the game version, you check the bottom of the list, that's where forge usually shows up.

Fairly sure it's 1.12.2+ for support, current version (1.14.4) and previous (stable) version, 1.12.2. You might get help for 1.11.x, but for certain nothing below that.

What launcher are you using?

Any mod you did not download from curseforge, you should delete and go redownload from curseforge. If you forget which ones, honestly I'd go do all of them.

If you know which mod it is, you should be able to just delete it from your mods folder. I would also make sure all mods downloaded from sketchy websites have been removed, who knows what's been packed into them or how out of date they are.

Post new logs for the new crash please

I don't think you're supposed to run optifine on a server (not 100% sure, but it seems wrong), if you remove it does it still happen?

And you are also still using a lot of mods that came from a bad website. The filenames give it away. Strongly urge you to delete them and redownload them from a legit site. Others will likely suggest the same.

Where did you download your mods from? You should only download from curseforge or the developers website, not sites like 9minecraft. Check out https://stopmodreposts.org/ for more information. If you downloaded them from anywhere else, I would delete them, and redownload them from curseforge.

if you add a line that says pause at the end of your bat file that starts the server (I assume you're using a batch file to start it), it will wait for a keypress before the screen closes to help see what's going on. Also, post your server log to a github gist or pastebin or something, and link it here, it will also help in figuring out what's wrong.

To expand upon this, make sure you at least skim through the description of the mod on CurseForge, just in case the mod you want says it requires another mod, you'll want to make sure you download any dependencies required. i.e. RFtools requires McJtyLib, so if you wanted RFTools, you would also have to make sure and download McJtyLib.

It looks like you may have 2 versions of the same mod in your mods folder. Make sure when you update a mod, that you remove the old one after putting the new one in there. Also, make sure you are downloading mods from curseforge or the developers websites, other websites like 9 minecraft and stuff are bad, check out https://stopmodreposts.org/ for more information on which sites to avoid if you are unsure.

Get ahold of the server logs for a period of time that the problems are happening, and post them to github/pastebin or something, and post the link here.