This is the error I get when running this

Server: Msg 170, Level 15, State 1, Line 13

Line 13: Incorrect syntax near 'max'.

Server: Msg 195, Level 15, State 1, Line 32

'OBJECT_SCHEMA_NAME' is not a recognized function name.

Server: Msg 137, Level 15, State 1, Line 46

Must declare the variable '@object_id'.

Server: Msg 137, Level 15, State 1, Line 53

Must declare the variable '@AddLine'.

Server: Msg 137, Level 15, State 1, Line 55

Must declare the variable '@DropLine'.

Server: Msg 137, Level 15, State 1, Line 56

Must declare the variable '@AddLine'.

Server: Msg 137, Level 15, State 1, Line 58

Must declare the variable '@AddLine'.

Server: Msg 137, Level 15, State 1, Line 60

Must declare the variable '@AddLine'.

Server: Msg 137, Level 15, State 1, Line 61

Must declare the variable '@DropLine'.

Server: Msg 137, Level 15, State 1, Line 70

Must declare the variable '@parent_object_id'.

Server: Msg 137, Level 15, State 1, Line 75

Must declare the variable '@fkline'.

Server: Msg 137, Level 15, State 1, Line 77

Must declare the variable '@pkline'.

Server: Msg 137, Level 15, State 1, Line 83

Must declare the variable '@fkline'.

Server: Msg 137, Level 15, State 1, Line 84

Must declare the variable '@pkline'.

Server: Msg 137, Level 15, State 1, Line 89

Must declare the variable '@fkline'.

Server: Msg 137, Level 15, State 1, Line 90

Must declare the variable '@pkline'.

Server: Msg 137, Level 15, State 1, Line 97

Must declare the variable '@AddLine'.

Server: Msg 137, Level 15, State 1, Line 99

Must declare the variable '@AddLine'.

Server: Msg 137, Level 15, State 1, Line 100

Must declare the variable '@AddLine'.

Server: Msg 137, Level 15, State 1, Line 102

Must declare the variable '@AddLine'.

Server: Msg 137, Level 15, State 1, Line 122

Must declare the variable '@DropScript'.

Server: Msg 137, Level 15, State 1, Line 123

Must declare the variable '@DropLine'.

Server: Msg 137, Level 15, State 1, Line 123

Must declare the variable '@AddScript'.

Server: Msg 137, Level 15, State 1, Line 125

Must declare the variable '@AddLine'.

Server: Msg 137, Level 15, State 1, Line 125

Must declare the variable '@object_id'.

Server: Msg 137, Level 15, State 1, Line 135

Must declare the variable '@DropScript'.

Server: Msg 137, Level 15, State 1, Line 135

Must declare the variable '@AddScript'.