have you tested the stand-alone version of Sen2Cor?
In any case, if you prefer using the installation with Anaconda, you have to install Anaconda with python 2.7. Please, see http://step.esa.int/thirdparties/sen2cor/2.4.0/Sen2Cor_240_Documenation_PDF/S2-PDGS-MPC-L2A-SRN-V2.4.0.pdf
Look here, especially tast post from Nicolas on modifying the SMAP environment:
Yes, I did,
Sentinel-2 Level 2A Processor (Sen2Cor), 2.4.0, created: 2017.06.05 started …
file does not exist: C:\Users\WolfA\Documents\sen2cor\cfg\GIP_L2A_AC
–GIP_L2A_AC is an optional argument. It is thought for expert users as is mentioned in the release note for SIIMPC-850. If you use this, you have to specify either the full path where this (your own configuration) is located or you have to put your own L2A_AC_GIPP.xml configuration file in the configuration directory. Unless you have a dedicated reason to use your own configuration file for atmospheric correction , do not use this argument.
Your call should simply be: L2A_Process --resolution=10