Commented Unassigned: Using 3.3.1 I get "Failed to get current plant time (-1)" [155]

I am using 3.3.1.The first part of the log shows:
Compiled for Linux (LE) 32 bit

Commandline Args: -d1 -v -ad7
Reading config './SBFspot.cfg'
Thu Jul 21 12:05:01 2016: INFO: Starting...
sunrise: 05:47
sunset : 21:46
Connecting to 00:80:25:2C:C5:C7 (1/10)
Initializing...
SUSyID: 125 - SessionID: 970141159 (0x39D32DE7)
SMA netID=02
Serial Nr: 77577C46 (2002222150)
BT Signal=73.7%
Logon OK
Failed to get current plant time (-1)
SetPlantTime returned an error: -1
SUSyID: 99 - SN: 2002222150
Device Name: SN: 2002222150
Device Class: PV-omvormers
Device Type: SB 1600TL-10
Software Version: 12.12.208.R
Serial number: 2002222150
SUSyID: 99 - SN: 2002222150
Device Status: OK
SUSyID: 99 - SN: 2002222150
Device Temperature: 0.0°C
SUSyID: 99 - SN: 2002222150
GridRelay Status: ?
SUSyID: 99 - SN: 2002222150
Pac max phase 1: 1600W
Pac max phase 2: 0W
Pac max phase 3: 0W
SUSyID: 99 - SN: 2002222150
Energy Production:
EToday: 3.702kWh
ETotal: 6103.922kWh
Operation Time: 15688.51h
Feed-In Time : 12867.38h
SUSyID: 99 - SN: 2002222150
DC Spot Data:
String 1 Pdc: 0.952kW - Udc: 180.00V - Idc: 5.294A
String 2 Pdc: 0.000kW - Udc: 0.00V - Idc: 0.000A
SUSyID: 99 - SN: 2002222150
AC Spot Data:
Phase 1 Pac : 0.891kW - Uac: 237.20V - Iac: 3.758A
Phase 2 Pac : 0.000kW - Uac: 0.00V - Iac: 0.000A
Phase 3 Pac : 0.000kW - Uac: 0.00V - Iac: 0.000A
Total Pac : 0.891kW
SUSyID: 99 - SN: 2002222150
Grid Freq. : 49.97Hz
SUSyID: 99 - SN: 2002222150
Current Inverter Time: 21/07/2016 12:05:14
Inverter Wake-Up Time: 21/07/2016 12:05:13
Inverter Sleep Time : 21/07/2016 12:05:14

As you can see I get two error messages about the reading and setting of the planttime.
Later it shows a proper Inverter Time, which is consistent with the computer time
Comments: I did send to you the first 5 parts of the logfile in chunks of 1950 bytes.