E0011: a type that nothing declares

A type is elementary (INT, TIME, … Ed.3 Table 10), a standard function block (TON, CTU, …), or declared in a TYPE block or as a FUNCTION_BLOCK in the project.

VAR t : TIMER; END_VAR     (* E0011: no type TIMER - TON? *)

A PROGRAM or FUNCTION name is not a type either.