TagsGroup | A beautiful android tag group widget | Widget library

I am trying to create a gatsby site where I have projects posted, each with tags. I followed a basic tutorial on creating a gatsby blog, and am now working through gatsby's tags as documented on their website. Along the way while changing variable names from path to slug to avoid reserved words, I seem to have messed up because I can no longer create blogpost pages, nor tag pages. Each post is enclosed in a folder named by the post title, holding an index.md file defining its content, date, tag etc.

The following error is output when I try to run gatsby develop,

ERROR #11323

My blog will display author's pic and name on each posts and for the template to load the proper one, I would need to pass a value thru context. The thing is $slug is already an object for blogPage function in gatsby-node.

Something like this:

I'm trying to implement tags to this website's blog using this tutorial Creating Tags Pages for Blog Posts from gatsbyjs.org. Copied and pasted both /templates/tags.js and /pages/tags.js, only editing gatsby-node.js with parts of the code the guide suggested. I did that because I'm already using a different code for generating blog post pages programmatically. The whole repo can be found here.

The thing is there's a page to display all tags gathered by the graphQL, but no pages at all to display posts marked with such. The links in that first one drive you to the default 404 pages. I'm not sure what could be wrong.

/templates/tags.js