In short: The recording error code "E2" is irrelevant to LENA Grow. Don't worry about it!

More detail: E2 is a system-wide code for a recording that is less than 9.5 hours long, the minimum duration needed to generate percentiles in LENA's other programs. LENA Grow classroom recordings are not considered appropriate for comparison against LENA's norms, which are derived from thousands of hours of home-based recordings, and so the 9.5-hour minimum does not apply. That's why a Grow recording can have an E2 code but a valid status.