Error in Pdal

After several Orthomosaics created just fine, I’ve got this error…

Traceback (most recent call last):
File “/code/”, line 47, in
File “/code/scripts/”, line 108, in process
method=‘poisson’ if args.fast_orthophoto else ‘gridded’)
File “/code/opendm/”, line 36, in create_25dmesh
max_workers=get_max_concurrency_for_dem(available_cores, inPointCloud)
File “/code/opendm/dem/”, line 34, in create_dems
fouts = list(, radius))
File “/usr/local/lib/python2.7/dist-packages/loky/”, line 794, in _chain_from_iterable_of_lists
for element in iterable:
File “/usr/local/lib/python2.7/dist-packages/loky/”, line 589, in result_iterator
yield future.result()
File “/usr/local/lib/python2.7/dist-packages/loky/”, line 433, in result
return self.__get_result()
File “/usr/local/lib/python2.7/dist-packages/loky/”, line 381, in __get_result
raise self._exception
Exception: Child returned 1

This was caused directly by
Traceback (most recent call last):
File “/usr/local/lib/python2.7/dist-packages/loky/”, line 418, in _process_worker
r = call_item()
File “/usr/local/lib/python2.7/dist-packages/loky/”, line 272, in call
return self.fn(*self.args, **self.kwargs)
File “/usr/local/lib/python2.7/dist-packages/loky/”, line 337, in _process_chunk
return [fn(*args) for args in chunk]
File “/code/opendm/dem/”, line 83, in create_dem
pdal.run_pipeline(json, verbose=verbose)
File “/code/opendm/dem/”, line 163, in run_pipeline
out =’ ‘.join(cmd) + ’ > /dev/null 2>&1’)
File “/code/opendm/”, line 34, in run
raise Exception(“Child returned {}”.format(retcode))
Exception: Child returned 1

Anyone knows why ?

Possibly running out of memory. Are you able to process a smaller subset?