Error: Invalid format: ui-icons_*HEXCOLOR*_256x240.png
at Image._parse (/app/lib/themeroller-image.js:236:11)
at new Image (/app/lib/themeroller-image.js:196:17)
at renderImage (/app/themeroller.js:14:2)
at Frontend.icon (/app/themeroller.js:98:3)
at /app/server.js:105:24
at Layer.handle [as handle_request] (/app/node_modules/express/lib/router/layer.js:95:5)
at next (/app/node_modules/express/lib/router/route.js:137:13)
at Route.dispatch (/app/node_modules/express/lib/router/route.js:112:3)
at Layer.handle [as handle_request] (/app/node_modules/express/lib/router/layer.js:95:5)
at /app/node_modules/express/lib/router/index.js:281:22