I have geoserver 2.5.1 running on ubuntu 14.04 server. I tried to compose an image mosaic with ImageMosaicPlugin but I always get a message Could not list layers for this store, an error occurred retrieving them: Failed to create reader from file:data/dalekovod and hints nul. Images are in the right file format because geoserver recognizes them, and I can load each at one of them separately but I have 120 images.

Any idea what could be the problem?

  • do you have write permission to the data directory (or more importantly does the user that is running GeoServer?)
    – Ian Turton
    Commented Jun 14, 2014 at 13:42
  • I have permission to read, write, and execute in geoserver folder. I can load 1 image from that folder, but Image Mosaic Plugin sends me above mentioned error message.
    – Klemen
    Commented Jun 14, 2014 at 18:12
  • This issue needs love and or funding see jira.codehaus.org/browse/GEOT-4715?filter=-2
    – Ian Turton
    Commented Jun 15, 2014 at 12:36
  • GEOT-4715 does not have much to do with this issue. It is about error message that does not tell details about what went wrong when something fails when creating the mosaic. Geoserver comes with image mosaic demo and the images are in /data_dir/coverages/mosaic_sample/ Can you make another image mosaic layer by using this directory and files?
    – user30184
    Commented Jun 15, 2014 at 18:59

1 Answer 1


Here are two others with the same problem:

All point to permission problems.

  • 3
    While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. - From Review
    – HDunn
    Commented Oct 4, 2017 at 6:19
  • Good point! That was literally my first post ever so thank you for helping me Commented Oct 5, 2017 at 21:44

Not the answer you're looking for? Browse other questions tagged or ask your own question.