AWS lambda : PortScannerError: 'nmap program was not found in path'

When I'm running nmap from AWS lambda function, I'm getting below mentioned error.

[ERROR] PortScannerError: 'nmap program was not found in path. PATH is : /var/lang/bin:/usr/local/bin:/usr/bin/:/bin:/opt/bin'
Traceback (most recent call last):
  File "/var/lang/lib/python3.7/imp.py", line 234, in load_module
    return load_source(name, filename, file)
  File "/var/lang/lib/python3.7/imp.py", line 171, in load_source
    module = _load(spec)
  File "<frozen importlib._bootstrap>", line 696, in _load
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/var/task/lambda_function.py", line 38, in <module>
    nmScan = nmap.PortScanner()
  File "/var/task/nmap/nmap.py", line 134, in __init__
    os.getenv('PATH')

Please help me solve this error.