RStan installation failure, status 65535, cannot open file 'file7001d882ea.cpp.err.txt'

Hellow
I am trying to use Rstan.
I followed the instructions from this page:

https://github.com/stan-dev/rstan/wiki/Installing-RStan-on-Windows

Under the section "Verify that Rtools can be used in R"

fx <- inline::cxxfunction( signature(x = "integer", y = "numeric" ) , '

• return ScalarReal( INTEGER(x)[0] * REAL(y)[0] ) ;

•                        ' )
  

#I get this result

Error in file(con, "r") : cannot open the connection
In addition: Warning messages:
1: In system(cmd, intern = !verbose) :
running command 'C:/PROGRA1/R/R-351.1/bin/x64/R CMD SHLIB file7001d882ea.cpp 2> file7001d882ea.cpp.err.txt' had status 65535
2: In file(con, "r") :
cannot open file 'file7001d882ea.cpp.err.txt': No such file or directory

the file name mentioned: 'file7001d882ea.cpp.err.txt' changes every time I try the same function again. but the status 65535 remains.

I am using the following:
R Version: 3.5.1
RStan Version: 2.17.3
Rtools: Rtools34.exe "Frozen"
OS: Windows 8

I spend a lot of time trying to solve that but I can not. I am grateful for any help.
thank you !

Start with the linked RStan Windows installation instructions and reproduce the inline::cxxfunction example using R 3.5.1, RStan 2.17.3, Rtools34, and Windows 8. Inspect the R CMD SHLIB invocation and whether its generated .err.txt file is created. Done means identifying a confirmed compatibility or configuration cause and documenting an actionable resolution.