Ok I run the debugger, it says error on line 1124 in the plugin
Uncaught SyntaxError: Unexpected end of JSON input
at JSON.parse (<anonymous>)
at MRP_GridInventory.js:1124
Ok I managed to fix it and now the inventory actually shows. The thing is there is almost no documentation for this plugin. I did not have any Window types because I thought the plugin was setup to work by itself in a default setting.
But now when I open up an inventory (chest) there is nothing in it and I cannot put stuff in, I cannot see the grid.
This plugin needs some serious documentation or demo.