I'm getting the below error, trying to import ThemeToggler from gatsby-plugin-dark-mode

module "C:/Users/Karim Elnemr/Desktop/my-gatsby-website/node_modules/gatsby-plugin-dark-mode/index"
Could not find a declaration file for module 'gatsby-plugin-dark-mode'. 'C:/Users/Karim Elnemr/Desktop/my-gatsby-website/node_modules/gatsby-plugin-dark-mode/index.js' implicitly has an 'any' type.
  Try `npm i --save-dev @types/gatsby-plugin-dark-mode` if it exists or add a new declaration (.d.ts) file containing `declare module 'gatsby-plugin-dark-mode';`ts(7016)

also I'm getting this errors on the terminal for ever I try to install the blugin

npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! While resolving: gatsby-starter-hello-world@0.1.0
npm ERR! Found: react@17.0.2
npm ERR! node_modules/react
npm ERR!   react@"^17.0.1" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer react@"16.x" from gatsby-plugin-dark-mode@1.1.2
npm ERR! node_modules/gatsby-plugin-dark-mode
npm ERR!   gatsby-plugin-dark-mode@"^1.1.2" from the root project
npm ERR!
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
npm ERR!

down below is where I imported the said plugin

import React from "react"
import { ThemeToggler } from "gatsby-plugin-dark-mode"

export default function ThemeToggle() {
  return (
    <ThemeToggler>
      {({ theme, toggleTheme }) => {
        if (theme == null) {
          return null
        }
        return (
          <label className="theme-switch">
            <input
              type="checkbox"
              onChange={e => toggleTheme(e.target.checked ? "dark" : "light")}
              checked={theme === "dark"}
            />
            <span className="toggle"></span>
          </label>
        )
      }}
    </ThemeToggler>
  )
}

need some explanation what dose it mean and why it's happening so I can solve it.