How Can I Debug: "Error starting server TypeError: Cannot read properties of undefined (reading 'prototype')" #3959

dylviz · 2023-04-30T00:14:13Z

dylviz
Apr 30, 2023

hi,

I've spent a few hours trying to figure this out and am not having too much luck. I've read through some of the discussions and looked through issues, but didn't find anything to help.

I am new to backend development and would appreciate some guidance on how I can efficiently debug the following error with starting my server:

$ npm run start

> medusa-starter-default@0.0.1 start
> cross-env npm run build && medusa start


> medusa-starter-default@0.0.1 build
> cross-env npm run clean && tsc -p tsconfig.json


> medusa-starter-default@0.0.1 clean
> cross-env ./node_modules/.bin/rimraf dist

[medusa-config] ⚠️ redis_url not found. A fake redis instance will be used.
info:    Using fake Redis
✔ Models initialized – 39ms
✔ Plugin models initialized – 14ms
✔ Strategies initialized – 56ms
⠋ Initializing modules
✔ Modules initialized – 41ms
✔ Database initialized – 1303ms
✔ Repositories initialized – 42ms
✔ Services initialized – 88ms
✔ Express intialized – 9ms
⠋ Initializing plugins
error:   Error starting server
TypeError: Cannot read properties of undefined (reading 'prototype')
    at registerPaymentServiceFromClass (...MedusaBackend/node_modules/@medusajs/medusa/dist/loaders/helpers/plugins.js:8:51)
    at ...MedusaBackend/node_modules/@medusajs/medusa/dist/loaders/plugins.js:363:87
    at step (...MedusaBackend/node_modules/@medusajs/medusa/dist/loaders/plugins.js:33:23)
    at Object.next (...MedusaBackend/node_modules/@medusajs/medusa/dist/loaders/plugins.js:14:53)
    at ...MedusaBackend/node_modules/@medusajs/medusa/dist/loaders/plugins.js:8:71
    at new Promise (<anonymous>)
    at __awaiter (...MedusaBackend/node_modules/@medusajs/medusa/dist/loaders/plugins.js:4:12)
    at ...MedusaBackend/node_modules/@medusajs/medusa/dist/loaders/plugins.js:354:87
    at Array.map (<anonymous>)
    at ...MedusaBackend/node_modules/@medusajs/medusa/dist/loaders/plugins.js:354:60

I followed this tutorial and everything was working. Then continued onto the "next step" suggestions of extending the Order entity and other things following the docs and the way it was shown in the tutorial, nothing crazy.

I did switch to using a potgresql database on ubuntu (that was working fine as well) but I don't think that's a problem because the same error happens when I go back to using the default sqlite.

I'm using the default plugin config:

const plugins = [
	`medusa-fulfillment-manual`,
	`medusa-payment-manual`,
	// To enable the admin plugin, uncomment the following lines and run `yarn add @medusajs/admin`
	// {
	// 	resolve: "@medusajs/admin",
	// 	/** @type {import('@medusajs/admin').PluginOptions} */
	// 	options: {
	// 		autoRebuild: true,
	// 	},
	// },
];

Any tips would be appreciated!
Thanks