Crestron SIMPL+ - Compiler Error 1306: I;O Declaration Only Globally

Crestron SIMPL+
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Software
Language Reference Guide - DOC. 5797G SIMPL+
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z 309
Compiler Error 1306
declaration error: Declaration type can only be used globally:
'<identifier>'
I/O declarations must be defined globally; they cannot be declared as local variables
inside of a function or library file.
The following are examples of this error:
INTEGER i; // ok
STRING str[100]; // ok
DIGITAL_INPUT di; // ok
DIGITAL_OUTPUT do; // ok
ANALOG_INPUT ai; // ok
ANALOG_OUTPUT ao; // ok
STRING_INPUT si[100]; // ok
STRING_OUTPUT so; // ok
BUFFER_INPUT bi[100]; // ok
FUNCTION MyFunc()
{
INTEGER i; // ok – not an I/O declaration
STRING str[100]; // ok – not an I/O declaration
DIGITAL_INPUT di; // error
DIGITAL_OUTPUT do; // error
ANALOG_INPUT ai; // error
ANALOG_OUTPUT ao; // error
STRING_INPUT si[100]; // error
STRING_OUTPUT so; // error
BUFFER_INPUT bi[100]; // error
}