the problem is somewhere in the last part of the config with examples. I did delete all that part.

my working config:

{
/* Type can be : normal, normalv7, lite, litev7, heavy, ultraheavy  */
"cryptonight_type" : "normalv7",

/* Intensity 0-> auto intensity, or value from 1-300  */
"intensity" : 0,

/* To use 2 threads per card set double_threads to true  */
"double_threads" : true,

/* Gpu target temperature, leave it on 0 if you don't want to use this option  */
"target_temperature" : 90,

/* If you use a SSL/TLS encrypted pool set this to true*/
"pool_use_tls" : true,

/* Mining pool address WITHOUT the stratum+tcp:// or stratum+tls:// part  */
"pool" : "xmr-eu1.nanopool.org:14433",

/* Address of you wallet  */
"wallet" : "mywallet",

/* Password for your wallet, probably just x  */
"password" : "x",

/* Location for devfee servers, to get better latency  */
"location" : "europe",

/* If you want to log console output, put a filename here  */
"log_file" : "log",

}