Changegamemode Bugg

Hello there! When i did this in server console: Changegamemode (MAP) DarkRP

i got this error:

---- Host_Changelevel ----
SOLID_VPHYSICS static prop with no vphysics model! (models/props_lab/corkboard001.mdl)
Lua initialized (Lua 5.1)
WireMod Installed. Version: 2491
ERROR! Module ‘zlib_b64’ not found!
Registering gamemode ‘sandbox’ derived from ‘base’
Error Vertex File for ‘Humans\Group03\Female_01.mdl’ checksum 1651350973 should be -1513987054
Error Vertex File for ‘Humans\Group03\Female_01.mdl’ checksum 1651350973 should be -1513987054
Error Vertex File for ‘Humans\Group03\Female_02.mdl’ checksum -877679977 should be 2029913059
Error Vertex File for ‘Humans\Group03\Female_02.mdl’ checksum -877679977 should be 2029913059
Error Vertex File for ‘Humans\Group03\Female_03.mdl’ checksum 240143532 should be 615020382
Error Vertex File for ‘Humans\Group03\Female_03.mdl’ checksum 240143532 should be 615020382
Error Vertex File for ‘Humans\Group03\Female_04.mdl’ checksum 1672347362 should be 1301134242
Error Vertex File for ‘Humans\Group03\Female_04.mdl’ checksum 1672347362 should be 1301134242
Error Vertex File for ‘Humans\Group03\Female_06.mdl’ checksum 590298028 should be -285173382
Error Vertex File for ‘Humans\Group03\Female_06.mdl’ checksum 590298028 should be -285173382
Error Vertex File for ‘Humans\Group03\Female_07.mdl’ checksum -1076405403 should be -710229447
Error Vertex File for ‘Humans\Group03\Female_07.mdl’ checksum -1076405403 should be -710229447
Error Vertex File for ‘Humans\Group03\Male_01.mdl’ checksum -229695971 should be -212341379
Error Vertex File for ‘Humans\Group03\Male_01.mdl’ checksum -229695971 should be -212341379
Error Vertex File for ‘Humans\Group03\male_02.mdl’ checksum -1451030114 should be -77034264
Error Vertex File for ‘Humans\Group03\male_02.mdl’ checksum -1451030114 should be -77034264
Error Vertex File for ‘Humans\Group03\male_03.mdl’ checksum 2003602517 should be -1034868466
Error Vertex File for ‘Humans\Group03\male_03.mdl’ checksum 2003602517 should be -1034868466
Error Vertex File for ‘Humans\Group03\Male_04.mdl’ checksum -1406767351 should be 100976022
Error Vertex File for ‘Humans\Group03\Male_04.mdl’ checksum -1406767351 should be 100976022
Error Vertex File for ‘Humans\Group03\Male_05.mdl’ checksum 1430913443 should be 1093669987
Error Vertex File for ‘Humans\Group03\Male_05.mdl’ checksum 1430913443 should be 1093669987
Error Vertex File for ‘Humans\Group03\male_06.mdl’ checksum -1040899698 should be 440869567
Error Vertex File for ‘Humans\Group03\male_06.mdl’ checksum -1040899698 should be 440869567
Error Vertex File for ‘Humans\Group03\male_07.mdl’ checksum 1372497916 should be -1469984080
Error Vertex File for ‘Humans\Group03\male_07.mdl’ checksum 1372497916 should be -1469984080
Error Vertex File for ‘Humans\Group03\male_08.mdl’ checksum 264500654 should be -587456159
Error Vertex File for ‘Humans\Group03\male_08.mdl’ checksum 264500654 should be -587456159
Error Vertex File for ‘Humans\Group03\male_09.mdl’ checksum -1185842804 should be -238698339
Error Vertex File for ‘Humans\Group03\male_09.mdl’ checksum -1185842804 should be -238698339
Registering gamemode ‘DarkRP’ derived from ‘sandbox’
ScriptEnforce is disabled
Compressing lua files into data pack…
Skipped. Datapack exists.
Executing dedicated server config file
Attempted to create unknown entity type info_ladder!
Can’t init info_ladder
Attempted to create unknown entity type info_ladder!
Can’t init info_ladder
Attempted to create unknown entity type info_ladder!
Can’t init info_ladder
Attempted to create unknown entity type info_ladder!
Can’t init info_ladder
Attempted to create unknown entity type info_ladder!
Can’t init info_ladder
Attempted to create unknown entity type info_ladder!
Can’t init info_ladder
Attempted to create unknown entity type info_ladder!
Can’t init info_ladder
Attempted to create unknown entity type info_ladder!
Can’t init info_ladder
Attempted to create unknown entity type info_ladder!
Can’t init info_ladder
Attempted to create unknown entity type info_ladder!
Can’t init info_ladder
‘server.cfg’ not present; not executing.
Unknown command “durgz_witty_sayings”

Missing server.cfg? please give me one and tell me what the other things are.
Oh btw. The Gamemode changed to DarkRP But it says sandbox in server menu:(