Electric is able to read the output of Cadence's Assura design-rule checker. These error files (with the extension ".err") can be read with the Import Assura DRC Errors... command (in menu Tool / DRC). After reading the error file, you can review the errors by typing ">" and "<" to step to the next and previous error that was found. You can also see a list of errors in the cell explorer (see Section 4-8).