Java.null.exception error during interferrogram processing


When I process the ENVISAT-ASAR image mode product of level 1 ASA_IMP_1P then during interferrogram formation the error come

java.null.exception error as shown in snapshot.

How can I remove this error? I am using WINDOWS 7 , 2 GB RAM, AND 30 GB free space in computer.

It’s not possible to do interferograms with IMP products. You need phase
from complex data. Use IMS products.

SNAP should give a meaningful error-message in this case, thanks for the report.

Input validation has been added in SNAP 2.0 but this is on an older 1.1.1