Module 'kong.tools.responses' not found - still available?

Hi,

I use Kong 1.1.2 and had below error loading a custom plugin.

2019/05/28 06:20:44 [error] 126904#0: init_by_lua error: /usr/local/share/lua/5.1/kong/tools/utils.lua:590: …plugins/kong/plugins
/pas-auth-request-plugin/handler.lua:3: module ‘kong.tools.responses’ not found:No LuaRocks module found for kong.tools.responses
no field package.preload[‘kong.tools.responses’]

Any help please,

Thanks.

Understand this is removed.But how can I modify responses in the body_filter stage?