404 not found nginx

[bjprogrammer]

I followed every step but when i try to deploy I get message like this-
osboxes@osboxes:~/projects/PerfKitExplorer$ appcfg.py --oauth2 update deploy

Note: the --oauth2 flag is now the default and can be omitted.

07:28 AM Application: gcpbench; version: beta
07:28 AM Host: appengine.google.com
07:28 AM Starting update of app: gcpbench, version: beta
07:28 AM Getting current resource limits.
07:28 AM Scanning files on local disk.
Could not guess mimetype for client/third_party/jquery/jquery.min.map. Using application/octet-stream.
Could not guess mimetype for client/third_party/angular-material/angular-material.scss. Using application/octet-stream.
Could not guess mimetype for client/third_party/angular/angular-animate.min.js.map. Using application/octet-stream.
Could not guess mimetype for client/third_party/angular/angular-aria.min.js.map. Using application/octet-stream.
Could not guess mimetype for client/third_party/angular/angular-sanitize.min.js.map. Using application/octet-stream.
Could not guess mimetype for client/third_party/angular/angular.min.js.gzip. Using application/octet-stream.
Could not guess mimetype for client/third_party/angular/angular.min.js.map. Using application/octet-stream.
Could not guess mimetype for client/third_party/jquery/jquery.min.map. Using application/octet-stream.
Could not guess mimetype for client/third_party/angular/angular-animate.min.js.map. Using application/octet-stream.
Could not guess mimetype for client/third_party/angular/angular.min.js.map. Using application/octet-stream.
Could not guess mimetype for client/third_party/angular-material/angular-material.scss. Using application/octet-stream.
Could not guess mimetype for client/third_party/angular/angular.min.js.gzip. Using application/octet-stream.
Could not guess mimetype for client/third_party/angular/angular-aria.min.js.map. Using application/octet-stream.
Could not guess mimetype for client/third_party/angular/angular-sanitize.min.js.map. Using application/octet-stream.
07:28 AM Cloning 51 static files.
07:28 AM Cloning 112 application files.
07:28 AM Uploading 2 files and blobs.
07:28 AM Uploaded 2 files and blobs.
07:28 AM Compilation starting.
07:28 AM Compilation completed.
07:28 AM Starting deployment.
07:28 AM Checking if deployment succeeded.
07:28 AM Deployment successful.
07:28 AM Checking if updated app version is serving.
07:28 AM Completed update of app: gcpbench, version: beta
07:28 AM Uploading index definitions.
osboxes@osboxes:~/projects/PerfKitExplorer$
.
On opening url I get 404 not found nginx