Why do I receive an error when importing assaydata? 

Why do I receive an error when importing assay data? 

The following error occurs:

This key is already associated with an element of this
collection

This error can occur if you do not define enough key fields in a table to fully define the relationships between data.  For example, in a plate-based assay, there is a table with Compound ID and Concentration, and only Compound ID is defined as a Key Field.  Checking the Key Field checkbox for Concentration will allow the data to import successfully.

This error may also occur if you are using a single-table assay, and you are trying to import data that contains duplicate data in one or more fields.  In this case, try removing all key fields from the assay.