Nginx showing directive is duplicate

[vivek goel]

nginx version: nginx/1.1.18

What is wrong in following declaration

  { ngx_string("v_max_result"),
        NGX_HTTP_MAIN_CONF | NGX_HTTP_LOC_CONF|NGX_HTTP_SRV_CONF |
NGX_CONF_TAKE1,
        ngx_conf_set_num_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_v_conf_t, max_result),
        NULL},

I am getting error
nginx: [emerg] "v_max_result" directive is duplicate


But if I declare it as string  it is working fine

  {     ngx_string("v_max_result"),
        NGX_HTTP_MAIN_CONF | NGX_HTTP_LOC_CONF|NGX_HTTP_SRV_CONF |
NGX_CONF_TAKE1,
        ngx_conf_set_str_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_v_conf_t, max_result),
        NULL},



regards
Vivek Goel
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