Instagram Feed not Found error

I successfully added an Instagram User to the Apline plugin but when i test or post the shortcode to generate a gallery i am getting the following error:

– Instagram feed not found.

Could anyone help?

———————————–
P0, UTC:12:50:37.5419, Start plugin.
P1, UTC:12:50:37.5433, Enqueue styles and scripts
P2, UTC:12:50:37.5433, Retrieve Photos
P3, UTC:12:50:37.5435, Check cache
P4, UTC:12:50:37.5825, Using get_transient()…
P5, UTC:12:50:37.5921, No cache found
P6, UTC:12:50:37.5922, Check for access_token
P7, UTC:12:50:37.5924, Try accessing Instagram feed
P8, UTC:12:50:37.5925, Use wp_remote_get() (cURL) to make request
P9, UTC:12:50:38.5492, Request complete
P10, UTC:12:50:38.5493, An error occured.
P11, UTC:12:50:38.5493, Code: 400
P12, UTC:12:50:38.5494, Message: Bad Request
P13, UTC:12:50:38.5494, Try request again using Alpine’s cURL function
P14, UTC:12:50:38.8065, Request complete
P15, UTC:12:50:38.8066, An error occured.
P16, UTC:12:50:38.8066, Code: 400
P17, UTC:12:50:38.8068, Content Received: {“meta”:{“error_type”:”APINotAllowedError”,”code”:400,”error_message”:”you cannot view this resource”}}
P18, UTC:12:50:38.8068, Failed using wp_remote_get()
P19, UTC:12:50:38.8068, Check your Instagram feed. If the feed is empty, then the problem is with Instagram. If you see a full page of text, then the problem is with the Alpine plugin or your web server.
P20, UTC:12:50:38.8069, Check Results
P21, UTC:12:50:38.8070, Print Message
P22, UTC:12:50:38.8070, Loading complete
Output

Sorry:

– Instagram feed not found.

https://www.ads-software.com/plugins/alpine-photo-tile-for-instagram/