Invalid version format and NullPointerException..

I found warnings as below:
Invalid version format and NullPointerException..

any suggestion?
please help

2018-04-23 13:44:34  WARN: [F60A68B0] error - invalid version format: ﾧ￉ﾮF￮ﾵ9W> "ￆMﾽO|ﾑﾗHￖ]ﾫﾡ?ￇﾭ￲$￐}￭MXﾨﾛ￠ﾸV.
ￄ "JJ
￀+￀/￀,￀0ￌﾩￌﾨ￀￀ ﾜ ﾝ / 5 - IllegalArgumentException (... < MainEventHandler:115 < *:104 < ... < GeocoderHandler:43 < ... < ExtendedObjectDecoder:52 < ...)
2018-04-23 13:43:40  WARN: [4D54BD54] error - NullPointerException (DeviceManager:301 < *:290 < OverspeedEventHandler:103 < BaseEventHandler:28 < ...)

Well, you are trying to use HTTPS when server expects regular HTTP protocol.

no..
I use http

and I also upgraded to 3.16
and the invalid version format warning is not showing now.. but the NullPointerException still occurs

2018-04-23 15:40:04  WARN: [A6761342] error - NullPointerException (DeviceManager:326 < *:315 < OverspeedEventHandler:103 < BaseEventHandler:28 < ...)
2018-04-23 15:40:04  INFO: [A6761342] disconnected

If you are using official release then this error likely means that you have corrupted database.

I m using SQL server.. can I know what table should I check?

I would start with devices table.

noted .. will check .. thanks

ok.. upgraded with new database .. warning no more occurs.. thanks