@shakeeb27 It means you're inputting the wrong seed words. Either you're typing it wrong (requires space after every word and 100% correct words) or you've written the words incorrectly initially.
If you've written down the words wrong... would be extremely hard to find out which word(s) you've written down incorrectly. Best way to find out is https://www.reddit.com/r/CryptoCurrency/comments/c0ef1l/bip39_24word_mnemonic_recovery_tool_if_any_1_word but this is highly technical so might be too complicated for you.
Regardless, don't think anyone can help you on this issue. It's your responsibility to write down your seed words correctly and to make sure it works/restores correctly.