I have one problem with mmm-modulebar only one module is working, if I add new one number two or tree, this modules are not working. Here my config, maybe anybody can help me.

{       		module: "MMM-Modulebar",
       			position: "top_bar", // This can be any of the regions.
			//header: "Module", // Optional
        		classes: "default everyone", // Optional
        		config: {
        			buttons: {
      					"1": {
      						module: "MMM-iFrame",
      						text: "SmartHome",
						symbol: "cloud",
      					},
						"2": {
      						module: "MMM-EARTH",
      						text: "Erde",
						symbol: "star-o",
      					},
      				}
       			}
    		},

Many thanks in advance!!