Build failed cause mxnet.dll is not a valid Win32 application

[ntbdusty]

Hello, guys. Could you help me?
When I tried to build app I've got an error
"Unable to load library 'C:\Users\Default.mxnet\cache\1.6.0-b-SNAPSHOT-20200120mkl-win-x86_64\mxnet.dll':
2020-01-23T03:20:04.060+0300 [ERROR] [system.err] %1 is not a valid Win32 application."

Command for build is "./gradlew run -Dmain=ai.djl.examples.training.TrainMnist"

It's strange, because I have the environment showed below:

java version "1.8.0_241"
Java(TM) SE Runtime Environment (build 1.8.0_241-b07)
Java HotSpot(TM) 64-Bit Server VM (build 25.241-b07, mixed mode)

Microsoft Windows [Version 10.0.17763.864]
OS Name Microsoft Windows 10 Enterprise LTSC
Version 10.0.17763 Build 17763
System Type x64-based PC

Gradle 6.0.1
Build time: 2019-11-18 20:25:01 UTC
Revision: fad121066a68c4701acd362daf4287a7c309a0f5

Kotlin: 1.3.50
Groovy: 2.5.8
Ant: Apache Ant(TM) version 1.10.7 compiled on September 1 2019
JVM: 1.8.0_162 (Oracle Corporation 25.162-b12)
OS: Windows 10 10.0 amd64

[frankfliu]

@ntbdusty
"Unable to load library 'C:\Users\Default.mxnet\cache\1.6.0-b-SNAPSHOT-20200120mkl-win-x86_64\mxnet.dll'
This message looks suspicious. Somehow java think you are running as user "Default", that's strange.

Would you please run following command and collect the output:

cd integration
..\gradlew debugEnv

If you are login as administrator in Windows, the correct location of mxnet.dll should look like following:

C:\Users\Administrator\.mxnet\cache\1.6.0-b-SNAPSHOT-20200120mkl-win-x86_64\mxnet.dll

Somehow your path missing a \ after Default

[ntbdusty]

Ouch, I have to explain, do not pay attention to it. I just replaced manually real user name.
It should looks like "" 'C:\Users\UserName.mxnet\cache\1.6.0-b-SNAPSHOT-20200120mkl-win-x86_64\mxnet.dll'
Also, see logs in attach:
build.log
debugEnv.log

[frankfliu]

@ntbdusty
I guess this is caused by you running gradle in MingW64 shell. Please try to run gradle in command prompt.

[ntbdusty]

@frankfliu
Unfortunately, the same result in command prompt. =(

[frankfliu]

@ntbdusty
This is really strange, mxnet.dll is a 64-bit DLL, and your java and windows are both 64-bit. Somehow your system trying to load mxnet.dll in 32-bit mode and failed.

Can you try one more thing: delete C:\Users\UserName.mxnet folder and try it again?
Another thing to try is: install vs2015 redistribution package, see: https://github.com/awslabs/djl/blob/master/docs/development/troubleshooting.md#3-build-fails-on-windows-caused-by-unsatisfiedlinkerror

[ntbdusty]

@frankfliu
Many thanks, reinstalling vs2015 solved the problem.
I should have read Troubleshooting more accurate.