I'm new to QGIS Graphical Modeler. I've used ArcMap model builder before and now trying out the Graphical Modeler in QGIS2.18.15.

I tried creating a simple model where I create a buffer for a line feature (river) and then clip point data with the newly created buffer. I want to extract the points that are located within the buffer zone.

Everything seems fine but when I hit execute I get an error: "not all arguments converted during string formatting".

Can someone please explain what does this mean and how to fix this?

Traceback (most recent call last):
File "C:/PROGRA~1/QGIS2~1.18/apps/qgis/./python/plugins\processing\core\GeoAlgorithm.py", line 203, in execute
File "C:/PROGRA~1/QGIS2~1.18/apps/qgis/./python/plugins\processing\modeler\ModelerAlgorithm.py", line 504, in processAlgorithm
                self.tr('Running %s [%i/%i]', 'ModelerAlgorithm') % (alg.description, len(executed) + 1, len(toExecute)))
            TypeError: not all arguments converted during string formatting
  • Out of curiosity, are you using QGIS in English or translated? Jan 3, 2018 at 14:01
  • I'm using a translated version.
    – KMA
    Jan 3, 2018 at 14:05
  • Which language? Does the same happen in English? Jan 3, 2018 at 14:07
  • I'm using a Finnish version of QGIS. I switched it to English and the model started working without any problems! Thank you. I'm curious about why it didn't work on the Finnish version..
    – KMA
    Jan 4, 2018 at 8:47

1 Answer 1


How to fix it

This is a bug in the Finnish translation affecting QGIS up to 2.18.15.

As a workaround switch to English or update to 2.18.16.


The code of the modeller tries to create a message saying something like "Running (algorithm name) [50/100]". The Finnish translation provided an incomplete template for this message.

This has been fixed now so you will be able to use any upcoming version of 2.18 (2.18.16 and up) without this problem.

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