SQL create table issue

Why is this SQL server 2008 statement giving me an error?

CREATE TABLE [tbl_state_code]( [P_Id] smallint NOT NULL PRIMARY KEY IDENTITY, [st_code] [varchar](2) NOT NULL); CREATE TABLE [tbl_state_name]( [P_Id] smallint NOT NULL PRIMARY KEY IDENTITY, [st_name] [varchar](20) NOT NULL, FOREIGN KEY (st_code) REFERENCES tbl_state_code(st_code)); Error: Msg 1769, Level 16, State 1, Line 6
Foreign key 'st_code' references invalid column 'st_code' in referencing table 'tbl_state_name'.
Msg 1750, Level 16, State 0, Line 6
Could not create constraint. See previous errors.



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