Question NodeJS stops when start another NodeJS App

[Unleashed Design]

Hello,

i am new to the hole Plesk hosting stuff, but get into a problem.

My current versions:
Ubuntu 18.04.5 LTS‬
Plesk Obsidian 18.0.32
NodeJS Extension

i have two Domains
www.aaa.de <- aktiv
www.bbb.de <- Locked

in domain www.aaa.de i have two sub-domains
1.aaa.de
2.aaa.de

on both i use nodeJS and GIT when i start 1.aaa.de in the node Interface it worked fine, but when i than start 2.aaa.de in the node interface 1.aaa.de stoped and i could not restart it. The same happens when i try to do it the other way (start 2.aaa.de frist than 1.aaa.de).

is there a hidden setting that i have to set to enable this or is this not possible to host multiple nodeJS Apps