Pixelmon Mod incompatability

[Sultia]

Describe the bug
A clear and concise description of what the bug is.
When pressing the Pixelmon button game crash
To Reproduce
Steps to reproduce the behavior:
Load up Pixelmon along side Dynamic Trees and press the Pixelmon button
Screenshots
If applicable, add screenshots to help explain your problem.
N/A
Rendering Glitches
Are you using Sodium (or any equivalent mods that mess with rendering)?
No I am not
Additional context
Add any other context about the problem here.
The button's purpose is to show your character and equip them with Pixelmon cosmetics
Crashes

• Are you running the latest version of Dynamic Trees?
  Yes 1.5.0-BETA07

• What addons are you using?
  None

• Are you on the latest version for each addon?
  N/A

If the above mods are current then please submit a full crash log. The crash log normally contains the names of mods and their versions. Don't be that guy who submitted a crash report without first checking that the versions are current.

Crash report: https://mclo.gs/OaXZs7M

Also, do not paste the crash report into the issue body! Use a paste site like Gist or Pastebin.

Mods List
If your crash log does not contain a list of mods or you have no crash log then please provide a full list of the mods you are using complete with mod versions.
What version of Forge are you running? (e.g. 1.12.2-14.23.5.2768)

Modlist:
dynamictrees-neoforge-1.21.1-1.5.0-BETA07.jar
Pixelmon-1.21.1-9.3.9-universal.jar

NeoForge Version: 21.1.209

[Sultia]

Cross posted to Pixelmon here: https://pixelmonmod.com/tracker.php?p=2&t=23029