I tried to activate tensorflow after creating tensorflow environment with Anaconda Prompt.
Then, Python clashed in fatal error as attached.

I searched this kind of issues and made environment variable for UTF-8 , but it did not work.

Does anyone have any suggestions?

Could you please provide the output as a text instead of a picture?

The below is the output of error.

:\Users\kitamura>activate tensorflow
パラメーターの書式が違います - [0x7FFD92395AD0]
[0x7FFD8F53DFE0] ANOMALY: meaningless REX prefix used
[0x7FFD8F555A20] ANOMALY: meaningless REX prefix used
[0x7FFD905417D0] ANOMALY: use of REX.w is meaningless (default operand size is 64)
[0x7FFD90567C60] ANOMALY: use of REX.w is meaningless (default operand size is 64)
[0x7FFD92395AD0] ANOMALY: meaningless REX prefix used
[0x7FFD8F53DFE0] ANOMALY: meaningless REX prefix used
[0x7FFD8F555A20] ANOMALY: meaningless REX prefix used
[0x7FFD905417D0] ANOMALY: use of REX.w is meaningless (default operand size is 64)
[0x7FFD90567C60] ANOMALY: use of REX.w is meaningless (default operand size is 64)
[0x7FFD92395AD0] ANOMALY: meaningless REX prefix used
Fatal Python error: Py_Initialize: can't initialize sys standard streams
LookupError: unknown encoding: [0x7FFD92395AD0] ANOMALY

Current thread 0x000031ac (most recent call first):
Fatal Python error: Py_Initialize: can't initialize sys standard streams
LookupError: unknown encoding: [0x7FFD92395AD0] ANOMALY

Current thread 0x00002bd0 (most recent call first):
Fatal Python error: Py_Initialize: can't initialize sys standard streams
LookupError: unknown encoding: [0x7FFD92395AD0] ANOMALY

Current thread 0x000004a4 (most recent call first):
Fatal Python error: Py_Initialize: can't initialize sys standard streams
LookupError: unknown encoding: [0x7FFD92395AD0] ANOMALY

Current thread 0x00002264 (most recent call first):

Does somebody know what causes above?

Well, it's not obvious that it has anything to do with CPython itself.  You should probably work with the community responsible for tensorflow, whatever that is, and if they find a bug in CPython you can come back here with a report.  Given the error message it looks like an invalid value is being passed to CPython as the system encoding, so most likely the bug is in tensorflow and/or your environment.

Understood. Thank you.

Since there is no evident CPython bug, I am closing this.  If CPython gets a bogus encoding for the std streams, it cannot output a normal traceback on sys.stderr.

From StackOverflow: "TensorFlow is an open source library for machine learning and machine intelligence. It is developed by Google and became open source in November 2015."  It obviously has a python binding as there are numerous questions tagged with both.

I searched SO for "[tensorflow] ANOMALY" and the 29 hits were about anomaly detection, as in detecting credit card fraud.  Suspecting that the error is not tensorflow specific, I searched "[anaconda] ANOMALY" and got the following, which reports a nearly identical error message, but with scikit-learn.
https://stackoverflow.com/questions/42732377/how-to-install-scikit-0-19-dev-version-in-anaconda
The advice was to reinstall after rechecking instructions.