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Please, attach the screenshot to a post.

This error can occur when an input layer is empty (has no polygons in it).

Please, make sure your input layer for step 1 algorithm is not empty and select polygons which represents your working zone.

The "GNI_Short User Guide for FTTx Planner.pdf" is distributed with GNI Free package (the zip archive you have downloaded).

Hello,

You have to create and open a work context in ‘WorkContextTracer’ plugin.

Please, follow the instructions described in "GNI_Short User Guide for FTTx Planner.pdf" chapter 5.

It is a problem with output command for GRASS7 tools, it was fixed in QGIS 2.18.14.
Please, update QGIS to version 2.18.14.

Hello,

Which operating system are you using?
Which version of QGIS, GRASS and QuickOSM are you using?

Could you provide full logs from algorithm window?

How do I handle the roads to use for the routing? For example 1) still use step 1 create GPON demand and route line from OSM and use step 1 prepare GPON demand with a separate layer with demand points?? 2) or use a separate roads layer in step 2 hiearchical clustering and connecting GPON demand to ...

Hello, I am trying to run the FTTH/GPON planning wizard for an area without the buildings in OpenStreetMaps. The buildings for the area I am working with are in a couple other layers, e.g. the building entrances, the building addresses, and another layer is for parcels. (...) How do I base the GPON ...

Hello, Thank you for the screenshots. This error is caused by locale settings. We will fix this bug in the next patch. In the meantime there is possible workaround. Just change QGIS locale setting to U.S. English (en_US). I also forgot to ask about the file gni.db, which is also in the ZIP but not m...

Hello, "[step 1] create GPON demand and route line from OSM" algorithm creates input for PlannerFTTH plugin from OpenStreetMap data. "Building filter expression" filters OSM building data. "Demand calculation expression" sets how many fibers are required. Expressions default values are based on buil...