Method private structure allocated failure

I added some of the enterprise functions to the basic_example and linked with wpa2, but I'm getting what sounds like an out of memory error even with this minimal program. This is with ESP8266_NONOS_SDK_V2.0.0_16_08_10, any ideas? I have the same error if I try a PEM client certificate and private key.

wifi_set_opmode(STATION_MODE);
wifi_station_set_wpa2_enterprise_auth(true);
wifi_station_set_reconnect_policy(false);
wifi_station_set_enterprise_username((u8*)EAP_USER, os_strlen(EAP_USER));
wifi_station_set_enterprise_password((u8*)EAP_PASSWORD, os_strlen(EAP_PASSWORD));
wifi_station_connect();

heap 46040 wifi status 1
state: 2 -> 0 (0)
scandone
state: 0 -> 2 (b0)
state: 2 -> 3 (0)
state: 3 -> 5 (10)
add 0
aid 1
cnt
Method private structure allocated failure

Full program here.
https://github.com/dfries/source-code-examples/blob/wpa2-eap/basic_example/user/user_main.c