Mcreator Java Model error

Hi I'm trying to make a Tnt block for my project and when i went to 3D models and Texture Mappings under Resorces I try to import a .java file cause that is what i need for it and it showed me a error that said this,

"Your Model name is not a valid java name!

Custom mob model names can not contain whitespace, start with number or contain any non ASCll letters.

Model name is not filename, but the name inside the model java code (model class name)!
The best solution to the problem is to properly define the model name in your modeler before exporting the model."

How can I fix it so I can export the .java model files in for my project?