R - Reticulate - Python - Pyomo - Solver (gurobi) did not exit normally

Hey community,

I tried to run the following code via R with reticulate and pyomo based on the solver "gurobi". The Python-code is working if I execute the code independently of R. Executing the code in R with the package "reticulate" doesn't work.

Information about the Python-code: A Simple Concrete Pyomo Model - https://pyomo.readthedocs.io/en/stable/pyomo_overview/simple_examples.html

Thanks in advance for your help!

Br, Alex

Code in Python:
from pyomo.environ import *
import pyutilib.subprocess.GlobalData
pyutilib.subprocess.GlobalData.DEFINE_SIGNAL_HANDLERS_DEFAULT = False
model = ConcreteModel()
model.x = Var([1,2], domain=NonNegativeReals)
model.OBJ = Objective(expr = 2*model.x[1] + 3*model.x[2])
model.Constraint1 = Constraint(expr = 3*model.x[1] + 4*model.x[2] >= 1)
opt = SolverFactory('gurobi')
opt.solve(model)

Code in R:
library("reticulate")
use_python("C:/Anaconda", required = TRUE)
setwd("C:/Users/SimpleConcretePyomoModel")
source_python("C:/Users/SimpleConcretePyomoModel/SimpleConcretePyomoModel.py")

Error in R:
Error in py_run_file_impl(file, local, convert) :
ApplicationError: Solver (gurobi) did not exit normally
ERROR: Solver (gurobi) returned non-zero return code (3221226505)
ERROR: Solver log: Fatal Python error: init_sys_streams: can't initialize sys
standard streams Traceback (most recent call last):
File "C:\Anaconda\lib\io.py", line 54, in <module>
ImportError: cannot import name 'open_code' from 'io' (unknown location)

Additional information:
python: C:/Anaconda/python.exe
libpython: C:/Anaconda/python38.dll
pythonhome: C:/Anaconda
version: 3.8.8 (default, Apr 13 2021, 15:08:03) [MSC v.1916 64 bit (AMD64)]
Architecture: 64bit
numpy: C:/Anaconda/Lib/site-packages/numpy
numpy_version: 1.20.3
pyomo_version: 5.7.2
reticulate_version: 1.20
gurobi_version: 9.1.2
RStudio_version: 1.4.1717
Spyder_version: 5.0.5