Solved Heed help with fixing error on plugin

can someone please tell me why i am getting this error? thanks

Code: http://pastebin.com/UnbZ7RFv

Error: http://prntscr.com/8kg4wj

 

@yourmaster01 I have just attempted to re-create your trouble, but it just errors saying there was an error writing to the file. I can't help you with this. Sorry.

 

@yourmaster01 First, a tip:

Code:

String c(String s) {
    return ChatColor.translateAlternateColorCodes('&', s);
}
//...
player.sendMessage(c("&cYou failed. &4lol"));
//...
((Sign) block.getState()).setLine(1, c("&aPrice&0: &6$&d600"));

Second, that is possibly the most impossible error I have seen. The only method that is called on that line is PlayerInteractEvent#getPlayer(), which can only throw a NullPointerException if the PlayerInteractEvent itself is null. So either you have a plugin improperly calling PlayerInteractEvents itself, or your Bukkit is fail.

 

The way i see it, the error is this line with the NPE
if(signs.containsKey(e.getClickedBlock().getLocation())){

Only dereferencing null objects will throw an npe, and in that, that means:
Either
1) signs is null at this point in execution (which is not possible with your setup)
2) event is null -- impossible
3) e.getClickedBlock is null - possible

Possible? Yes- Interact event can trigger when there is a click made but if a block is not within distance and selected, then it registers as an air click, which isn't a clicked block, hence getClickedBlock returns null in this event