These troubleshooting steps can fix most surface level issues when trying to stake on our platform
1) Make sure both your browser of choice and your wallet version is up to date
2) Disable any adblocks
3) Disable any and all VPNs
4) Disconnect and reconnect wallet
5) Unset wallet collateral and ctrl+f5
6) Reset wallet collateral and ctrl+f5
7) Restart your browser
8) Restart your machine
This error is commonly due to not having enough ADA in the wallet for the transaction. Adding ADA to the wallet is usually the solution.
If you have recently swapped on a DEX you may have too much collateral tied up for the staking transaction. Wait half an hour and try another staking attempt.