encodings.CodecRegistryError (attempt to get data from weather station via API)

Maker
1

I’ve installed the API helper functions provided by the weather station I’m trying to connect to. I did this using ‘pip install ambient_api==1.5.1’ and creating a symlink from …/ignition/user-lib/pylib/site-packages to the jython install folder’s site-packages.

First problem:
when I try to test code using igniton’s script console, it seems to be using a local cache copy of everything, well almost everything. I don’t think it brings over a copy of the environment variables needed and maybe more, so I get errors related to that— so next I tried to create a button in perspective, with a script–

Second problem:
within the perspective button script, I have:

	from ambient_api.ambientapi import AmbientAPI
	import time
	
	api = AmbientAPI()
	devices = api.get_devices()
	
	device = devices[0]
	
	time.sleep(1) #pause for a second to avoid API limits
	
	print(device.get_data())

when I click the button, I get the following errors

com.inductiveautomation.ignition.common.script.JythonExecException
Traceback (most recent call last):
  File "<function:runAction>", line 2, in runAction
  File "/usr/local/bin/ignition/user-lib/pylib/site-packages/ambient_api/ambientapi.py", line 4, in <module>
    import requests
  File "/usr/local/bin/ignition/user-lib/pylib/site-packages/requests/__init__.py", line 120, in <module>
    from . import utils
  File "/usr/local/bin/ignition/user-lib/pylib/site-packages/requests/utils.py", line 27, in <module>
    from ._internal_utils import to_native_string
  File "/usr/local/bin/ignition/user-lib/pylib/site-packages/requests/_internal_utils.py", line 11, in <module>
    from .compat import is_py2, builtin_str, str
  File "/usr/local/bin/ignition/user-lib/pylib/site-packages/requests/compat.py", line 31, in <module>
    import json
  File "/usr/local/bin/ignition/user-lib/pylib/json/__init__.py", line 108, in <module>
    from .decoder import JSONDecoder
  File "/usr/local/bin/ignition/user-lib/pylib/json/decoder.py", line 24, in <module>
    NaN, PosInf, NegInf = _floatconstants()
  File "/usr/local/bin/ignition/user-lib/pylib/json/decoder.py", line 18, in _floatconstants
    _BYTES = '7FF80000000000007FF0000000000000'.decode('hex')
  File "user-lib/pylib/encodings/__init__.py", line 142, in search_function
    raise CodecRegistryError,\
encodings.CodecRegistryError: incompatible codecs in module "encodings.hex_codec" (/usr/local/bin/ignition/user-lib/pylib/encodings/hex_codec.py)

	caused by org.python.core.PyException
Traceback (most recent call last):
  File "<function:runAction>", line 2, in runAction
  File "/usr/local/bin/ignition/user-lib/pylib/site-packages/ambient_api/ambientapi.py", line 4, in <module>
    import requests
  File "/usr/local/bin/ignition/user-lib/pylib/site-packages/requests/__init__.py", line 120, in <module>
    from . import utils
  File "/usr/local/bin/ignition/user-lib/pylib/site-packages/requests/utils.py", line 27, in <module>
    from ._internal_utils import to_native_string
  File "/usr/local/bin/ignition/user-lib/pylib/site-packages/requests/_internal_utils.py", line 11, in <module>
    from .compat import is_py2, builtin_str, str
  File "/usr/local/bin/ignition/user-lib/pylib/site-packages/requests/compat.py", line 31, in <module>
    import json
  File "/usr/local/bin/ignition/user-lib/pylib/json/__init__.py", line 108, in <module>
    from .decoder import JSONDecoder
  File "/usr/local/bin/ignition/user-lib/pylib/json/decoder.py", line 24, in <module>
    NaN, PosInf, NegInf = _floatconstants()
  File "/usr/local/bin/ignition/user-lib/pylib/json/decoder.py", line 18, in _floatconstants
    _BYTES = '7FF80000000000007FF0000000000000'.decode('hex')
  File "user-lib/pylib/encodings/__init__.py", line 142, in search_function
    raise CodecRegistryError,\
encodings.CodecRegistryError: incompatible codecs in module "encodings.hex_codec" (/usr/local/bin/ignition/user-lib/pylib/encodings/hex_codec.py)


Ignition v8.1.0 (b2020110211)
Java: Azul Systems, Inc. 11.0.7

I don’t understand what this is telling me. Can anyone help me through it?

2

I see this problem occasionally, too. One thing that sometimes solves the problem sometimes is opening the project properties, making a minor change, and then saving the changes. It seems that this somehow triggers something to be refreshed.

There’s a discussion about this problem here:

http://forum.inductiveautomation.com/t/codecregistryerror-when-importing-json-library/

I’ve also talked with Inductive Automation support about the issue, but we haven’t had any luck getting to the bottom of it.

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