[potentially resolved] :"Trouble processing your request" for new contributions despite basic config

## Describe the bug
I'm a new user of All Contributors, and I'm interested in using it to acknowledge future contributors for an open source toolkit to help develop experimental medical imaging techniques. However, when I installed the GitHub bot app and tried to test it out, the bot returned that dreaded error message:

> `We had trouble processing your request. Please try again later.`

This has occurred when I tried to call the bot [from a pull request](https://github.com/rosetta-code/rosetta-doc/pull/7) as well as in [an issues report](https://github.com/rosetta-code/rosetta-doc/issues/11).

I understand that this is a vague issue that has resurfaced in various forms in the past. I found and tried many of those attempts, but none of these fixes worked for me:

* [Ensuring that a config file does not exist without a readme file](https://github.com/all-contributors/app/issues/201)
* [Purposely deleting the config file so that the bot tries to regenerate it](https://github.com/all-contributors/app/issues/198)
* [Using the new, reformatted config file format](https://github.com/the-turing-way/the-turing-way/pull/843) as it appears on the [bot app documentation](https://allcontributors.org/docs/en/bot/configuration)
* [Ensuring that the "commitType" argument doesn't include a specific scope](https://github.com/all-contributors/app/issues/485) (I don't have this explicitly defined to begin with)
* [Removing specific config file arguments related to readme templates](https://github.com/all-contributors/all-contributors/issues/681)
* [Copying-and-pasting the contents of the config file for the All Contributors bot repository (and obviously modifying it in a minimally necessary way for correct context)](https://github.com/all-contributors/all-contributors/blob/master/.all-contributorsrc)

I'm aware that, per [this issue](https://github.com/all-contributors/app/issues/315), using the CLI seems like the best solution here. However, I'm not really experienced in JavaScript, so I'd like to avoid having to deal with that unless it's truly impossible without it. Given this, could you help me figure out why this is the case and/or what I could do about it?

Note that this is a copy of [this issue](https://github.com/all-contributors/all-contributors/issues/777), which I *think* I originally put in the wrong repo. If you end up seeing both, please reply to this Issue instead.

## To Reproduce
1. Open an issue or pull request ticket in [my repository](https://github.com/rosetta-code/rosetta-doc)
2. Type a comment that should be a valid All Contributors bot request (e.g. `@_all-contributors please add @_keitaay for code`, but omit the underscores)
3. Submit that comment

## Expected behavior
* The requested addition/modification to the contributor's table is added
***OR***
* A specific error is raised by the bot that indicates what needs to be fixed