an error occured!

i need help with this error, whenever i save my yml file this error still pop up on my screen. i do refresh the web browser (chrome) but it still the same error,

Here take a look. please reply my thread

Essentials,

Chestcommands,

and more plugin with editted by yml file.

every time i edit the yml file too long, then i save the config and the error appears. the error appears when i edit my config yml too long. all the plugins is fine, but the config yml somtimes error like the picture.

iam using chrome and the extensions :

IDM Module

Stylish

i need help please. trying to edit and yml file plugin chatcontrol