Hi, I'm trying to make a plugin that launches you in a parabolic motion when touching a slime block. I found a helper method to do this and was able to import it with no problem. However, when trying to utilise the method, Maven decides to throw the error "An unknown compilation problem occurred". Current code: Code (Text): @EventHandler public void onUseLaunchPadEvent(PlayerMoveEvent event) { Player player = event.getPlayer(); if (player.getLocation().getBlock().getRelative(BlockFace.DOWN).getType() == Material.SLIME_BLOCK) { Vector from = player.getLocation().toVector(); Vector to = new Location(player.getWorld(), 34, 4, 0, -90, 4).toVector(); player.setVelocity(calculateVelocity(from, to, 6)); } } public Vector calculateVelocity(Vector from, Vector to, int heightGain) { // Gravity of a potion double gravity = 0.115; // Block locations int endGain = to.getBlockY() - from.getBlockY(); double horizDist = Math.sqrt(distanceSquared(from, to)); // Height gain int gain = heightGain; double maxGain = gain > (endGain + gain) ? gain : (endGain + gain); // Solve quadratic equation for velocity double a = -horizDist * horizDist / (4 * maxGain); double b = horizDist; double c = -endGain; double slope = -b / (2 * a) - Math.sqrt(b * b - 4 * a * c) / (2 * a); // Vertical velocity double vy = Math.sqrt(maxGain * gravity); // Horizontal velocity double vh = vy / slope; // Calculate horizontal direction int dx = to.getBlockX() - from.getBlockX(); int dz = to.getBlockZ() - from.getBlockZ(); double mag = Math.sqrt(dx * dx + dz * dz); double dirx = dx / mag; double dirz = dz / mag; // Horizontal velocity components double vx = vh * dirx; double vz = vh * dirz; return new Vector(vx, vy, vz); } private double distanceSquared(Vector from, Vector to) { double dx = to.getBlockX() - from.getBlockX(); double dz = to.getBlockZ() - from.getBlockZ(); return dx * dx + dz * dz; } Error occurs when I try and specify 'to' as the second parameter, but the error does not occur if I try and specify 'from'. For example: This errors: Code (Text): player.setVelocity(calculateVelocity(from, to, 6)); This does not error: Code (Text): player.setVelocity(calculateVelocity(from, from, 6)); I have no idea what could be causing this. Any help is appreciated, thanks.

is Vector directly imported? can we see the rest of the class? have you tried rebuilding the project in your IDE? this does not mean start from scratch matching server versions? matching java versions?

Thanks for the reply. Here's my code: https://pastebin.com/raw/0RBuaqkq I haven't run into any troubles when using the other vector 'from' as the second argument which is super weird and why I'm so confused about why this isn't compiling. Not very helpful that Maven doesn't provide any information either EDIT: ignore statics, they weren't there when I was testing