Error while running yarn start: backend

I have purchased Light Blue Vue Node.js Template yesterday. 1. I can't connect to github as it requires me to extend. (my github: Coolfusionstudio). Also, the link that refers to "nodejs backend documentation" just not works: https://github.com/flatlogic/nodejs-backend 2. I got an error message when I ran the command: yarn start:backend (same error: yarn start)

Error: error:0308010C:digital envelope routines::unsupported at new Hash (node:internal/crypto/hash:71:19) at Object.createHash (node:crypto:133:10) at module.exports (/Users/Wallace/Desktop/Flatlogic Vue/flatlogic-vue-v3.31/nodemodules/@vue/cli-service/nodemodules/webpack/lib/util/createHash.js:135:53) at NormalModule.initBuildHash (/Users/Wallace/Desktop/Flatlogic Vue/flatlogic-vue-v3.31/nodemodules/@vue/cli-service/nodemodules/webpack/lib/NormalModule.js:417:16) at handleParseError (/Users/Wallace/Desktop/Flatlogic Vue/flatlogic-vue-v3.31/nodemodules/@vue/cli-service/nodemodules/webpack/lib/NormalModule.js:471:10) at /Users/Wallace/Desktop/Flatlogic Vue/flatlogic-vue-v3.31/nodemodules/@vue/cli-service/nodemodules/webpack/lib/NormalModule.js:503:5 at /Users/Wallace/Desktop/Flatlogic Vue/flatlogic-vue-v3.31/nodemodules/@vue/cli-service/nodemodules/webpack/lib/NormalModule.js:358:12 at /Users/Wallace/Desktop/Flatlogic Vue/flatlogic-vue-v3.31/nodemodules/loader-runner/lib/LoaderRunner.js:373:3 at iterateNormalLoaders (/Users/Wallace/Desktop/Flatlogic Vue/flatlogic-vue-v3.31/nodemodules/loader-runner/lib/LoaderRunner.js:214:10) at Array. (/Users/Wallace/Desktop/Flatlogic Vue/flatlogic-vue-v3.31/nodemodules/loader-runner/lib/LoaderRunner.js:205:4) at Storage.finished (/Users/Wallace/Desktop/Flatlogic Vue/flatlogic-vue-v3.31/nodemodules/enhanced-resolve/lib/CachedInputFileSystem.js:55:16) at /Users/Wallace/Desktop/Flatlogic Vue/flatlogic-vue-v3.31/nodemodules/enhanced-resolve/lib/CachedInputFileSystem.js:91:9 at /Users/Wallace/Desktop/Flatlogic Vue/flatlogic-vue-v3.31/nodemodules/graceful-fs/graceful-fs.js:123:16 at FSReqCallback.readFileAfterClose as oncomplete { opensslErrorStack: [ 'error:03000086:digital envelope routines::initialization error' ], library: 'digital envelope routines', reason: 'unsupported', code: 'ERROSSLEVPUNSUPPORTED' }

Node.js v18.13.0 error Command failed with exit code 1. info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

Please suggest how to solve it. Thanks