Unstable cluster after rebalance and failover test on windows

Install couchbase server 2.0.0r-248 on 4 nodes.
Run rebalance and failover with replica 1 tests on the cluster.
I check diag logs, I see a lot of crash report in it.

crasher:
initial call: mc_daemon:init/1
pid: <0.4543.0>
registered_name: []
exception exit: ejson_nif_not_loaded
in function gen_fsm:terminate/7
ancestors: [<0.4542.0>]
messages: []
links: [<0.4542.0>,<0.4544.0>]
dictionary: []
trap_exit: false
status: running
heap_size: 987
stack_size: 24
reductions: 241
neighbours:
neighbour: [

{pid,<0.4542.0>}

,

{registered_name,[]}

,
{initial_call,{mc_connection,init,1}},
{current_function,{gen,do_call,4}},

{ancestors,[]}

,

{messages,[]}

,

{links,[<0.327.0>,<0.4543.0>]}

,