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Error: The expression must have a parameter specified

Description

This error is displayed in the list of errors and warnings at the bottom of the procedure editor when a built-in variable or function is used in a procedure that does not have its parameter specified - i.e. the item that it is to be applied to.

For example, the Number of visits to a zone built-in variable needs to specify which zone it is - this zone is a 'parameter' to the built-in variable. Any built-in variable or function that requires a parameter must have that parameter specified.

Example

The following procedure uses two built-in variables; one of them has a missing parameter (i.e. the zone has not been specified), which will result in this error.

Figure 1. The first use of this built-in variable is set correctly; the second has a missing parameter (which zone it is) and will result in this error.

See also:

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ANY-maze help topic T0511