I have created a Report parameter called "Region".

The type is Integer and it is a multi-value list.

For my values, I entered the following data:

Label    Value
Central Ontario   1
Eastern Ontario   2
North Western Ontario  3
Northern Ontario  4
South Central Ontario  5
South Western Ontario  6
Region field not completed =IsNothing(Parameters!Region.Value(0))

When I run the report, I get the following error:

An error occurred during local report processing.
Error during processing of 'Region' report parameter.

What have I done wrong?

Thanks.