VirusTotal API Key

[alamlearnN]

Hi......
I have mentioned VirusTotal API Key in config.json file but when i run knockpy it shows that VirusTotal Key is not found.

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• checking for virustotal subdomains: SKIP
  VirusTotal API_KEY not found
• checking for wildcard: NO
• checking for zonetransfer: NO
• resolving target: YES

• scanning for subdomain...

Thanks.