when i run the rescan script i get the following output:

Traceback (most recent call last):
  File "/home/bitcoin/electrumserver/eps/rescan-script.py", line 71, in <module>
    main()
  File "/home/bitcoin/electrumserver/eps/rescan-script.py", line 67, in main
    rpc.call("rescanblockchain", [height])
  File "/home/bitcoin/electrumserver/eps/electrumpersonalserver/jsonrpc.py", line 58, in call
    raise JsonRpcError(response["error"])
electrumpersonalserver.jsonrpc.JsonRpcError: {'code': -32601, 'message': 'Method not found'}

I am very new to this, so please explain for beginners :).