Solved Error with signs

Im trying to add signs to my plugin.
I want the code to execute when I right click a sign with "[something]" on it.
Here is my code:

Code:java

@EventHandler
public void onInteract(PlayerInteractEvent event) {
if (event.getAction().equals(Action.RIGHT_CLICK_BLOCK)) {
BlockState state = event.getClickedBlock().getState();
if (state instanceof Sign) {
Sign sign = (Sign) event.getClickedBlock();
if (sign.getLine(0).equalsIgnoreCase("[something]")) {
//code
}
}
}
}

Whenever I click the sign, the console gives an error "Could not pass PlayerInteractEvent to (PluginName)"
Later in the error it says "...block.CraftBlock cannot be cast to org.bukkit.block.Sign"
Ive tried so many tutorials for clicking a sign, then checking what is on the sign, but they all dont work, so can someone tell me the right way to check the text of a clicked sign then execute some code if it has some text on it.

Yes, I also try this, and it doesnt work either:
(Just want to say that yes, I did place a wall sign)

Code:java

@EventHandler
public void onInteract(PlayerInteractEvent event) {
if (event.getAction().equals(Action.RIGHT_CLICK_BLOCK)) {
if (event.getClickedBlock().getType() == Material.WALL_SIGN) {
Sign sign = (Sign) event.getClickedBlock();
if (sign.getLine(0).equalsIgnoreCase("[something]")) {
//this happens if it works
Player player = (Player) event.getPlayer();
player.sendMessage("It worked.");
}
}
}
}

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

Ah, sorry, I got it all wrong. What you need to do is cast Sign to the block's state, not the block itself.
For example,

Code:java

Block block = event.getClickedBlock();
if (block.getState() instanceof Sign) {
Sign sign = (Sign) block.getState();
}

 

Wizehh Thank you so much, it worked.
For anyone that wants to see, this is the final code that worked:

Code:java

@EventHandler
public void onInteract(PlayerInteractEvent event) {
if (event.getAction().equals(Action.RIGHT_CLICK_BLOCK)) {
BlockState state = event.getClickedBlock().getState();
if (state instanceof Sign) {
Sign sign = (Sign) state;
if (sign.getLine(0).equalsIgnoreCase("[something]")) {
//this happens if it works
Player player = (Player) event.getPlayer();
player.sendMessage("It worked.");
}
}
}
}