ERROR!: Can't create physics object for

so i host a server on my computer where we play stuff like prop hunt and TTT. But on every map i use i get this error ERROR!: Can’t create physics object for… on alot of diffrent props. for instance on the map “newoffice” i get this :
if anyone has any idea on how to fix it or what is causing this problem please help.

n’t create physics object for models/props/cs_office/plant01.mdl
ERROR!: Can’t create physics object for models/props/cs_office/plant01.mdl
ERROR!: Can’t create physics object for models/props/cs_office/phone.mdl
ERROR!: Can’t create physics object for models/props/cs_office/radio.mdl
ERROR!: Can’t create physics object for models/props/cs_office/file_cabinet3.mdl
ERROR!: Can’t create physics object for models/props/cs_office/file_cabinet3.mdl
ERROR!: Can’t create physics object for models/props/cs_office/file_cabinet3.mdl
ERROR!: Can’t create physics object for models/props/cs_office/file_cabinet1.mdl
ERROR!: Can’t create physics object for models/props/cs_office/file_cabinet1.mdl
ERROR!: Can’t create physics object for models/props/cs_office/file_cabinet1.mdl
ERROR!: Can’t create physics object for models/props/cs_office/file_cabinet1.mdl
ERROR!: Can’t create physics object for models/props/cs_office/file_cabinet1.mdl
ERROR!: Can’t create physics object for models/props/cs_office/file_cabinet1.mdl
ERROR!: Can’t create physics object for models/props/cs_office/file_cabinet1.mdl
ERROR!: Can’t create physics object for models/props/cs_office/file_cabinet1.mdl
ERROR!: Can’t create physics object for models/props/cs_office/trash_can.mdl
ERROR!: Can’t create physics object for models/props/cs_office/Water_bottle.mdl
ERROR!: Can’t create physics object for models/props/cs_office/Water_bottle.mdl
ERROR!: Can’t create physics object for models/props/cs_office/Water_bottle.mdl
ERROR!: Can’t create physics object for models/props/cs_office/Water_bottle.mdl
ERROR!: Can’t create physics object for models/props/cs_office/trash_can.mdl

Edit: there are alot more than these on that map.

Mount CSS to your server.