trying to solo mining, but ran into this error:
[2014-01-01 18:25:00] Started cgminer 3.5.0
[2014-01-01 18:25:02] Probing for an alive pool
[2014-01-01 18:25:06] Failed to connect to stratum on localhost:9888
[2014-01-01 18:25:06] Pool 0 slow/down or URL or credentials invalid


my vip.conf is
rpcuser=user
rpcpassword=pwd
rpcallowip=127.0.0.1
rpcport=9888
daemon=1
server=1
listen=1
gen=0
addnode=37.187.58.155
addnode=79.108.180.52
addnode=162.243.41.224
addnode=86.26.190.235
addnode=68.83.182.90
addnode=94.22.75.142

open wallet and start cgminer:
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer --scrypt -I 19 -g 1 -w 256 --thread-concurrency 22400 --gpu-engine 1050g --gpu-memclock 1475 --gpu-vddc 1.087 --temp-target 78 --auto-fan -o localhost:9888 -u user -p pwd


what is the issue?

cgminer --scrypt -I 19 -g 1 -w 256 --thread-concurrency 22400 --gpu-engine 1050g --gpu-memclock 1475 --gpu-vddc 1.087 --temp-target 78 --auto-fan -o http://localhost:9888 -u user -p pwd