Hi Gerhard,
Generally, the "#Error" happens when using multivalue parameter in a
expression. Values in a multivalue parameter is stored in an array.
If we use the following expression for a multivalue parameter, we will get
the "#Error" error:
=Parameters!param.values
To fix the issue, please join the values in the parameter using JOIN
function:
=JOIN(Parameters!param.Values, ",")
If that does not help, could you please send us the sample report and
sample application? That will help us to understand the root cause and
solve the issue.
--
Sincerely,
Zhi-Qiang Ni
Microsoft Online Support
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