Use logger for exceptions

velocity/src/main/java/com/github/games647/fastlogin/velocity/task/AsyncPremiumCheck.java

@@ -78,7 +78,7 @@ public class AsyncPremiumCheck extends JoinManagement<Player, CommandSource, Vel
             Thread.currentThread().interrupt(); // Restore the interrupt flag
             return event;
         } catch (ExecutionException e) {
-            e.printStackTrace();
+            core.getPlugin().getLog().error("Error firing event", e);
             return event;
         }
     }

velocity/src/main/java/com/github/games647/fastlogin/velocity/task/ForceLoginTask.java

@@ -98,7 +98,7 @@ public class ForceLoginTask
             Thread.currentThread().interrupt(); // Set the interrupt flag again
             return event;
         } catch (ExecutionException e) {
-            e.printStackTrace();
+            core.getPlugin().getLog().error("Error firing event", e);
             return event;
         }
     }