The issue is because of your use of the wildcard character within the DCount function. If you look at the parameters for DCount, you will see that they are
DCount(
expr,
domain, [
criteria]), and the specification for expr is the name of the Field, whose records you want to count. Wildcard character is not a Field name, so the function fails.
Replace the wildcard character with the name of a primary key field within your table named "ECH". That will count every record within the table. If you want to refine your count, then you would add parameters for the Criteria parameter.
HTH
