using nbt tags in plugins main.php

Hello, just a quick question but recently when i start up my server it crashes when loading a plugin which uses a nbt tag (float). Why does this occur and is it replaceable/fixable?
Here is the crash (if helpful):

PHP:

Fatal error: Cannot use pocketmine\nbt\tag\Float as Float because 'Float' is a special class name in C:\Users\test\Desktop\test\plugins\SlapIt-master\src\slapit\entity\SlappableHuman.php on line 14


 

Im unsure as to what your getting at?

 

completely forgot and it was just when I restarted my server after adding the new phar