[WinError 126] when configuring Snappy (snappy-conf)

digital-idiot · March 12, 2018, 5:42am

The snappy-conf.bat throws error in the verbose log:

failed with return code 30.
Please check the log file 'C:\Program Files\Python36\Lib\site-packages\snappy\snappyutil.log'.
        at org.esa.snap.python.PyBridge.configureJpy(PyBridge.java:223)
        at org.esa.snap.python.PyBridge.installPythonModule(PyBridge.java:147)
        at org.esa.snap.rcp.cli.SnapArgsProcessor.processPython(SnapArgsProcessor.java:103)
        at org.esa.snap.rcp.cli.SnapArgsProcessor.process(SnapArgsProcessor.java:49)
        at org.netbeans.modules.sendopts.DefaultProcessor.process(DefaultProcessor.java:202)
        at org.netbeans.spi.sendopts.Option$1.process(Option.java:387)
        at org.netbeans.api.sendopts.CommandLine.process(CommandLine.java:317)
        at org.netbeans.modules.sendopts.HandlerImpl.execute(HandlerImpl.java:62)
        at org.netbeans.modules.sendopts.Handler.cli(Handler.java:69)
        at org.netbeans.CLIHandler.notifyHandlers(CLIHandler.java:234)
        at org.netbeans.core.startup.CLICoreBridge.cli(CLICoreBridge.java:82)
        at org.netbeans.CLIHandler.notifyHandlers(CLIHandler.java:234)
        at org.netbeans.CLIHandler$1.exec(CLIHandler.java:268)
        at org.netbeans.CLIHandler.finishInitialization(CLIHandler.java:447)
        at org.netbeans.MainImpl.finishInitialization(MainImpl.java:256)
        at org.netbeans.Main.finishInitialization(Main.java:92)
        at org.netbeans.core.startup.Main.start(Main.java:316)
        at org.netbeans.core.startup.TopThreadGroup.run(TopThreadGroup.java:123)
        at java.lang.Thread.run(Unknown Source)
Python configuration error: Python configuration failed.
Command ["C:\Program Files\Python36\python.exe" .\snappyutil.py --snap_home "C:\Program Files\snap" --java_module "C:\Program Files\snap\snap\modules\org-esa-snap-snap-python.jar" --force --log_file .\snappyutil.log --java_home "C:\Program Files\snap\jre" --req_arch amd64]
failed with return code 30.
Please check the log file 'C:\Program Files\Python36\Lib\site-packages\snappy\snappyutil.log'.

Error logged in the snappyutil.log is:

ERROR: Configuration failed
Traceback (most recent call last):
  File ".\snappyutil.py", line 261, in _main
    force=args.force)
  File ".\snappyutil.py", line 210, in _configure_snappy
    __import__('snappy')
  File "C:\Program Files\Python36\Lib\site-packages\snappy\..\snappy\__init__.py", line 63, in <module>
    jpyutil.preload_jvm_dll()
  File "C:\Program Files\Python36\Lib\site-packages\snappy\jpyutil.py", line 344, in preload_jvm_dll
    return ctypes.CDLL(jvm_dll_file, mode=ctypes.RTLD_GLOBAL)
  File "C:\Program Files\Python36\lib\ctypes\__init__.py", line 348, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: [WinError 126] The specified module could not be found

How can I fix it? Any help will be appreciated. Thanks

marpet · March 12, 2018, 7:28am

Try with an older Python version. Python is supported till version 3.4. Above it might work, or not.

digital-idiot · March 12, 2018, 8:09am

@marpet Thanks for the heads up. But it works with python 3.6. I use snappy with python 3.6 in my personal laptop and it works fine. There was no error at the time of configuration as well.

marpet · March 12, 2018, 8:19am

Mmm?? Yes it can work, but it is not guaranteed. At least I haven’t tried.
Do you use a different SNAP version on your laptop?
Maybe it helps, if you delete the .snap directory in your home folder.

digital-idiot · March 12, 2018, 8:21am

No, I use the same snap version in my laptop. Only thing is that my laptop runs on Linux x64.

hakim · March 12, 2018, 6:31pm

I confirm that it doesn’t work with python36, as mentioned in the docs but it works on python34.
With python36 I get the following error when I try to import snappy:

import jpy ImportError: Module use of python34.dll conflicts with this version of Python.

It’s not an issue for me to work on python34 but I’m just wondering (the end-of-life for Python 3.4 is March 2019), is it because of jpy that snappy wasn’t upgraded to support python36?

digital-idiot · March 13, 2018, 5:44am

In my case it does work. See:

Which version of jpy did you install? There is a release of jpy v0.9.0(jpy-0.9.0-cp36-cp36m-win_amd64.whl) for python 3.6. You can check out all the releases of jpy here: https://github.com/bcdev/jpy/releases

hakim · March 13, 2018, 12:03pm

I confirm that both jpy and snappy are now working for me on Python-3.6.5.

njwag · July 24, 2018, 3:56pm

Hello, I have the same issue. I am using Python 2.7 and SNAP 6.0. The snappyutil.txt file looks as follows:

Any help will be greatly appreciated. Thanks

marpet · July 25, 2018, 6:11am

It could be that not all pieces share the same bitness.
As you are on a 64-bit system all software should be 64 bit. Maybe the Python instance you have is only 32-bit.
Could you check this, please?

njwag · July 25, 2018, 6:35am

Hello marpet, thanks for your swift reply! I am using Anaconda 2 64-Bit and the Windows 64-Bit version of SNAP with all toolboxes.

marpet · July 27, 2018, 10:02am

I don’t really know what is wrong. It must be something with the DLL of the JVM.
It is named jvm.dll and is usually located in “C:\Program Files\snap\jre\bin\server”. It seems that it is found but cannot be loaded. For whatever reason.

frx089 · April 1, 2020, 9:16am

the problem is that jpyconfig is wrongly created, so for example if JDK_HOME is C:\Program Files\Java\jdk1.8.0_241
in jpyconfig.py the jvm_dll variable is set to C:\Program Files\Java\jdk1.8.0\jre\bin\server\jvm.dll
so it is missing “_241”, the bug needs to be fixed in jpy project but a workaround would be to go to jpyconfig.py file and set right jvm_dll manually or just use a JDK_HOME without underscores

gnwiii · November 5, 2020, 12:46pm

For the benefit of those searching for OSError: [WinError 126] The specified module could not be found when setting up snappy:

The error will occur when a dynamic library used by the Java dynamic library isn’t found on the system. This solution “works for me”.