Got 504 Error when write file into FTPS server about goftp

[magua33]

My config:

	config := goftp.Config{
		User:               "XXXX",
		Password:           "XXXXX",
		ConnectionsPerHost: 10,
		Timeout:            10 * time.Second,
		Logger:             os.Stderr,
		TLSConfig: &tls.Config{
			InsecureSkipVerify: true,
		},
		TLSMode: TLSImplicit,
	}

Message:

goftp: 0.000 #1 opening TLS control connection to XXX.XXX.XXX.XXX:XXXX
goftp: 0.135 #1 sending command USER XXXX
goftp: 0.165 #1 got 331-Password required for XXX
goftp: 0.165 #1 sending command PASS ******
goftp: 0.191 #1 got 230-Logged on
goftp: 0.192 #1 sending command FEAT
goftp: 0.221 #1 got 211-Features:
 MDTM
 REST STREAM
 SIZE
 MLST type*;size*;modify*;
 MLSD
 AUTH SSL
 AUTH TLS
 PROT
 PBSZ
 UTF8
 CLNT
 MFMT
 EPSV
 EPRT
End
goftp: 0.222 #1 was ready
goftp: 0.222 #1 sending command TYPE I
goftp: 0.248 #1 got 200-Type set to I
goftp: 0.248 #1 sending command EPSV
goftp: 0.275 #1 got 229-Entering Extended Passive Mode (|||121|)
goftp: 0.275 #1 opening data connection to [XXX.XXX.XXX.XX]:121
goftp: 0.301 #1 upgrading data connection to TLS
goftp: 0.301 #1 sending command PROT P /TestPolicyimage/JUBAO/readme
goftp: 0.326 #1 got 504-Protection level P /TESTPOLICYIMAGE/JUBAO/README not recognized
goftp: 0.326 #1 was ready
goftp: 0.326 #1 sending command TYPE I
goftp: 0.355 #1 got 200-Type set to I
goftp: 0.355 #1 sending command SIZE 1.txt
goftp: 0.380 #1 got 213-13
goftp: 0.380 #1 was ready
goftp: 0.381 #1 was ready
goftp: 0.381 #1 sending command TYPE I
goftp: 0.406 #1 got 200-Type set to I
goftp: 0.406 #1 sending command EPSV
goftp: 0.432 #1 got 229-Entering Extended Passive Mode (|||121|)
goftp: 0.432 #1 opening data connection to [219.141.242.74]:121
goftp: 0.456 #1 upgrading data connection to TLS
goftp: 0.456 #1 sending command PROT P 1.txt
goftp: 0.483 #1 got 504-Protection level P 1.TXT not recognized