Tester wont start

[Dumbination]

Hello! Whenever I try to use the strategy tester, the following occurs:

2018.12.01 02:42:30.426    Tester    USDJPY: history check started
2018.12.01 02:42:30.626    Tester    USDJPY: history data begins from 1999.01.04 00:00
2018.12.01 02:42:30.627    Core 2    connecting to 127.0.0.1:3000
2018.12.01 02:42:30.628    Core 2    connected
2018.12.01 02:42:30.638    Core 2    authorized (agent build 1940)
2018.12.01 02:42:30.643    Tester    USDJPY,M15 (FBS-Demo): visual testing of Experts\Simple Dumb.ex5 from 2018.10.01 00:00 to 2018.11.16 00:00
2018.12.01 02:42:30.731    Core 2    common synchronization completed
2018.12.01 02:42:31.243    Tester    quality of analyzed history is 100%
2018.12.01 02:42:33.101    Core 2    connection closed

Any idea why it might be happening?