lesson2：deploy first contract

[sjkandlion]

This is the error：No injected provider found. Make sure your provider (e.g. MetaMask, ...) is active and running (when recently activated you may have to reload the page).
when i using remix IDE to deploy my first contract， choosing the environment as 'inject provider', this error happen. But i have opened
metaMask in the background!
help me please!!!
帮帮我！

[jvc-byte]

Hi there @sjkandlion, the error "No injected provider found" typically occurs when Remix IDE cannot detect the MetaMask extension or another web3 provider in your browser. Check for the below to make sure your meta mask and remix IDE is properly connected

• Ensure MetaMask is Active: Make sure MetaMask is unlocked and connected to the correct network (e.g., Ethereum Mainnet, Ropsten, sepolia linea, optimism, fantom etc.).

As you can see from the image above, Remix IDE and MetaMask wallet are both connected but the accounts are totally different. This can sometimes happen due to poor internet connection thereby making Remix IDE failing to fetch all the parameters.

• Browser Refresh: Sometimes, simply refreshing the browser can help Remix detect MetaMask.
• Reconnect to MetaMask: from your MetaMask disconnect from Remix IDE and re-select injected provider - MetaMask in Remix IDE. Then open your MetaMask wallet to accept the connection if MetaMask didn't pop up.
• Browser Compatibility: Make sure you are using a supported browser like Chrome, edge, brave or Firefox. If you're using a different browser, try switching to one of these.

If your MetaMask wallet is properly connected to Remix IDE, it should look like this:

After putting the above in check your MetaMAsk wallet should be well connected to Remix IDE and you seamlessly deploy a deployable code.

PS: I advice you constantly push your code to GitHub to avoid hours of coding going to waste by loosing your codes!! Visit here to know how to connect your remix ide to github.