zabbix appliance server Permission denied

[abel_zhyb]

I wrote a python script and placed into /usr/lib/zabbix/alertscripts/wechat.py
chown zabbix.zabbix wechat.py
-rwxr-xr-x 1 zabbix zabbix 1944 Sep 12 17:24 wechat.py*

zabbix appliance server log show error:
Original event ID: 73646''
31096:20170912:173805.411 End of zbx_popen():7
31483:20170912:173805.411 zbx_popen(): executing script
31096:20170912:173805.413 In zbx_waitpid()
31096:20170912:173805.413 zbx_waitpid() exited, status:126
31096:20170912:173805.413 End of zbx_waitpid():31483
31096:20170912:173805.413 wechat.py output:
sh: 1: /usr/lib/zabbix/alertscripts/wechat.py: Permission denied

How to do? Thanks