The multi-part identifier could not be bound

trying this

select tblPersonalInfo.companyname, tblJobBudget.title,tblJobBudget.lastmodifiedby,
tblJobAdv.advtitle, tblJobAdv.userId,       
tblApplication.advid, tblApplication.position
from tblJobAdv 
inner join tblApplication
ON tblJobAdv.advid = tblApplication.advid
inner join tblPersonalInfo
On tblJobBudget.lastmodifiedby = tblPersonalInfo.userid

gives error

Msg 4104, Level 16, State 1, Line 8
The multi-part identifier "tblJobBudget.lastmodifiedby" could not be bound.
Msg 4104, Level 16, State 1, Line 2
The multi-part identifier "tblJobBudget.title" could not be bound.
Msg 4104, Level 16, State 1, Line 2

The multi-part identifier "tblJobBudget.lastmodifiedby" could not be bound.

This is because there aren't any table or table alias with tblJobBudget identifier.

Your tables are:

• tblJobAdv
• tblApplication
• tblPersonalInfo

But not:

• tblJobBudget

If you need columns from table tblJobBudget you should include tblJobBudget in tables with a join clause:

from       tblJobAdv 
inner join tblApplication
   ON tblJobAdv.advid = tblApplication.advid
inner join tblJobBudget                              <--here
   ON ...
inner join tblPersonalInfo
   ON ...