Mail Rules Type Mismatch Error

When I create a new mail rule, I get a Type Mismatch error. What is a type mismatch?

Subject: Mail Rules Type Mismatch Error

Hi,

One of the following conditions could have caused this error:

You attempted an operation on operands with conflicting data types.

You assigned a value to a variable that has a different data type, and LotusScript cannot convert it automatically.

You are passing a value as an argument that has a different declared data type, and LotusScript cannot convert it automatically.

You used a string as the initial value, or as the To or Step value, in a For statement.

IBM - Error “Notes Error: Type Mismatch” when Creating Mail Rule …

JYR