Unable to creat a RGB image: Unexpected Exception Error

Good morning,

I tried to create a RGB image with Red = B8, Green = B4 and Blue = B3.
I got a messagem saying it could not be created stating the following:

Unexpected Exception
java.lang.illegalArgumentException: Expressions are invalid

I am assuming that it is not a problem of resolutions because B2, B3, B4 and B8 all have 10 m resolution, right?

Thank you for the help

Hi Sara,

It should be possible: it works for me:

Can you provide Orbit and Tile details?



S2 MPC Operations Manager

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Hi Jan

I downloaded from AWS (http://sentinel-pds.s3-website.eu-central-1.amazonaws.com/) bands B2, B3, B4 and B8 from:
WXU Tile (9.11.2016)

I managed to do the RGB data using B2, B3 and B4.
When I try to do Red = B8, Green = B4 and Blue = B3 this error appeared…

Thank you for asking Jan,


Can you check the messages.log file if there is more information to find about this error.
The messages.log file is located in <user_home>/AppData/Roaming/SNAP/var/logs

So somethings seem to be special with B8. You can open the Information Window (Analysis–>Information) and compare it with the other bands. Maybe you can see some differences.

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Dear @marpet and @Jan

Thank you once again for your help.
I applied the old but golden rule: I shut down everything and restarted and… now it works !


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