API Key or signiture not valid

hi,

I created an app on Flickr on my account. Then it gave me an api key and api secret. I copy and pasted that into default settings of the plugin. But when I hit submit it keeps saying that the API Key or Signiture is not valid.

I don’t know what I did wrong?

Please help.

https://ww.wp.xz.cn/plugins/awesome-flickr-gallery-plugin/