masscan PortScannerError报错

File "C:\Program Files\Python39\lib\site-packages\masscan\masscan.py", line 127, in __init__
raise PortScannerError(
masscan.masscan.PortScannerError: 'masscan program was not found in path. PATH is : D:\\software\\WINDOWS.X64_193000_db_home\\bin;C:\\Program Files\\Python39\\Scripts\\;C:\\Program Files\\Python39\\;C:\\Program Files (x86)\\Common Files\\Oracle\\Java\\javapath;C:\\Program Files\\Common Files\\Oracle\\Java\\javapath;C:\\Windows\\system32;C:\\Windows;C:\\Windows\\System32\\Wbem;C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\;C:\\Windows\\System32\\OpenSSH\\;C:\\Program Files\\TortoiseSVN\\bin;D:\\python\\Python27\\Scripts;D:\\python\\Python27;C:\\Users\\t08021\\AppData\\Local\\Microsoft\\WindowsApps;C:\\Program Files\\Java\\jdk1.8.0_271\\bin;C:\\Program Files\\Java\\jdk1.8.0_271\\jre\\bin;D:\\Program Files (x86)\\Nmap'