Script not showing up at AG and error message

[Ardenian]

Error: Could not load the source for https://dotd.idrinth.de/static/userscript/2.0.0/.

TypeError: this._extraPools is null

Stack: addActorPool@resource://gre/modules/commonjs/toolkit/loader.js -> resource://devtools/server/main.js:1448:5

get threadLifetimePool@resource://gre/modules/commonjs/toolkit/loader.js -> resource://devtools/server/actors/script.js:489:7

SourceActor<.onSource/<@resource://gre/modules/commonjs/toolkit/loader.js -> resource://devtools/server/actors/source.js:463:11

Handler.prototype.process@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:937:23

this.PromiseWalker.walkerLoop@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:816:7

this.PromiseWalker.scheduleWalkerLoop/<@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:750:11

Line: 1448, column: 5

Stack-Trace:

SourceActor<.onSource/<@resource://gre/modules/commonjs/toolkit/loader.js -> resource://devtools/server/actors/source.js:470:15

Handler.prototype.process@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:940:21

this.PromiseWalker.walkerLoop@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:816:7

this.PromiseWalker.scheduleWalkerLoop/<@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:750:11