java.lang.NoSuchMethodError with GSON parseString

I saw issue #224 and I tried the solution in there, and that did not work. I invalidated/restarted my IntelliJ cache, I tried to remove the GSON library I was using and used the one that the JAR downloaded when I put it into my build.gradle, nothing seems to have worked.

I am using v6.5.4 as that is the last version (that I’m aware of) that is compiled with Java 8.

Here is where the problem is:

    AuthorizationCodePKCERequest authorizationCodePKCERequest = api.authorizationCodePKCE(code, VERIFIER).build();
    try {
      AuthorizationCodeCredentials credentials = authorizationCodePKCERequest.execute();

After I run .execute() it throws an exception:

Exception in thread "Thread-15" java.lang.NoSuchMethodError: com.google.gson.JsonParser.parseString(Ljava/lang/String;)Lcom/google/gson/JsonElement;
	at com.wrapper.spotify.SpotifyHttpManager.getResponseBody(SpotifyHttpManager.java:296)
	at com.wrapper.spotify.SpotifyHttpManager.post(SpotifyHttpManager.java:183)
	at com.wrapper.spotify.requests.AbstractRequest.postJson(AbstractRequest.java:123)
	at com.wrapper.spotify.requests.authorization.authorization_code.pkce.AuthorizationCodePKCERequest.execute(AuthorizationCodePKCERequest.java:37)

Which I find weird, because when opening it up in IntelliJ Ctrl + Click, it… doesn’t have any errors? And Ctrl + Clicking parseString brings me to the method it otherwise could not find?

The request works fine, as I did some testing before trying to get the authorization codes and the callback worked fine, and I was able to get the code + the window opens to authorize with my application.

Any pointers? I’m genuinely confused and I’m entirely lost.

Edit: Proof that I can get the code just fine: