Here is a step-by-step guide to help you troubleshoot issues with missing Metamask when calling the approval function using an ERC20 token:
Step 1: Verify Metamask installation and configuration
Make sure that you have Metamask installed correctly in your browser. If it is installed but not activated, try activating it by clicking on the three dots next to the Ethereum address and selecting “Metamask” > “Activate”.
Step 2: Confirm ERC20 token support
Check that the ERC20 token (e.g. ETH) supports Metamask on your network. You can do this by:
a. Going to [Metamask]( settings.
b. Checking the list of supported tokens and networks.
Step 3: Make sure Metamask is connected
Check if Metamask is connected to your Ethereum account by:
a. Go to [Metamask]( settings.
b. Make sure that “Connect Wallet” (or “Wallet” in older versions) is enabled and configured correctly.
Step 4: Check the Contract Address
Make sure that the contract address you are trying to call the approval function from matches the one provided by MetaMask when prompted for authorization:
a. Go to [Metamask]( settings.
b. Click “Wallet” > “Connect Wallet” (or “Connect Wallet” in older versions).
c. Select your Ethereum account and click “Connect”.
d. Navigate back to the contract address you are trying to call the approval function from.
Step 5: Check Metamask functionality
Try to enable all Metamask features by:
a. Go to [Metamask]( settings.
b. Select “Full Wallet” > “Enable Full Wallet”.
c. Click “Save”.
Step 6: Check Token Balance and Contract Permissions
Make sure your ERC20 token balance is sufficient for the contract function call:
a. Go to [Metamask]( settings.
b. Select the wallet you connected earlier (e.g. MetaMask).
c. Go to the “Balance” tab.
d. Make sure your token balance is greater than or equal to the amount required for the contract function call.
Step 7: Check Contract Permissions
Check that Metamask has been granted the necessary permissions on your contract:
a. Go to [Meta-Contract]( or [Etherscan](
b. Select your contract.
c. Click “Permissions” > “Grant/Revoke Permission”.
d. Ensure that Metamask has been granted the necessary permissions to call the contract function.
Step 8: Check Erc20 Token Metadata
Make sure that you have access to the ERC20 token metadata (e.g. “0x…”) in your contract code:
a. Go to [Etherscan]( or [Meta-Contract](
b. Select your contract.
c. Click “Token” > “Metadata”.
d. Make sure the metadata is correct and includes the ERC20 token address.
Step 9: Try Again
If you have completed all of these steps, try calling the approval function from Metamask again:
a. Go to [Metamask]( settings.
b. Select “Wallet” > “Connect Wallet” (or “Connect Wallet” in older versions).
c. Click “Save”.
d. Go back to your contract address and try calling the approval function from Metamask.
If none of these steps resolve the issue, please provide more details about your setup, including:
- The specific contract address you are trying to call the approval function from
- The Erc20 token address provided by MetaMask when prompted for authorization
- Any error messages or logs that may be available
I hope this helps! Feel free to contact me if you have any further questions.