URI malformed

when I start server in webpack all works but I have this strange error, anyone can help me?

URIError: URI malformed
    at decodeURIComponent (<anonymous>)
    at getFilenameFromUrl (/Applications/MAMP/htdocs/bedrock-urca/web/app/themes/urca/node_modules/webpack-dev-middleware/lib/GetFilenameFromUrl.js:6:8)
    at webpackDevMiddleware (/Applications/MAMP/htdocs/bedrock-urca/web/app/themes/urca/node_modules/webpack-dev-middleware/middleware.js:39:18)
    at call (/Applications/MAMP/htdocs/bedrock-urca/web/app/themes/urca/node_modules/connect/index.js:239:7)
    at next (/Applications/MAMP/htdocs/bedrock-urca/web/app/themes/urca/node_modules/connect/index.js:183:5)
    at next (/Applications/MAMP/htdocs/bedrock-urca/web/app/themes/urca/node_modules/connect/index.js:161:14)
    at next (/Applications/MAMP/htdocs/bedrock-urca/web/app/themes/urca/node_modules/connect/index.js:161:14)
    at respModifierMiddleware (/Applications/MAMP/htdocs/bedrock-urca/web/app/themes/urca/node_modules/resp-modifier/index.js:73:28)
    at call (/Applications/MAMP/htdocs/bedrock-urca/web/app/themes/urca/node_modules/connect/index.js:239:7)
    at next (/Applications/MAMP/htdocs/bedrock-urca/web/app/themes/urca/node_modules/connect/index.js:183:5)
    at /Applications/MAMP/htdocs/bedrock-urca/web/app/themes/urca/node_modules/browser-sync/lib/snippet.js:86:13
    at call (/Applications/MAMP/htdocs/bedrock-urca/web/app/themes/urca/node_modules/connect/index.js:239:7)
    at next (/Applications/MAMP/htdocs/bedrock-urca/web/app/themes/urca/node_modules/connect/index.js:183:5)
    at next (/Applications/MAMP/htdocs/bedrock-urca/web/app/themes/urca/node_modules/connect/index.js:161:14)
    at Function.handle (/Applications/MAMP/htdocs/bedrock-urca/web/app/themes/urca/node_modules/connect/index.js:186:3)
    at Server.app (/Applications/MAMP/htdocs/bedrock-urca/web/app/themes/urca/node_modules/connect/index.js:51:37)
    at Server.<anonymous> (/Applications/MAMP/htdocs/bedrock-urca/web/app/themes/urca/node_modules/engine.io/lib/server.js:443:22)
    at Server.<anonymous> (/Applications/MAMP/htdocs/bedrock-urca/web/app/themes/urca/node_modules/socket.io/lib/index.js:266:16)
    at emitTwo (events.js:106:13)
    at Server.emit (events.js:194:7)
    at parserOnIncoming (_http_server.js:565:12)
    at HTTPParser.parserOnHeadersComplete (_http_common.js:99:23)