HELP???? How to Make own custom Rom

Hi Guys ,
I am using LG Optimus One (P500),I had some problems in making custom ROM for this device.

I was following this guide-- By GuneetAtwal.

By this i was complete all the procedure that gives in the guide. Ex- Installing Kitchen , Setup kitchen , creating a working folder by Using A base ROM. In my case base ROM is-

After i was creating a working folder successfully. then i was Change/modify/update rom . Ex- i was adding apps on my rom. in apps folder ..
After i was done all changes , modification in ROM ,Now time to creating rom using working folder.
now i start cygwin,
.enter option 99 - "biuld rom from working folder" , After build option and few more enters.
When its all done i was find a folder inside "cygwin/home/yousername/kitchen" called

When i was flashing ROM into the mode recovery its says Failed.
In my Case Recovery is TWRP
================================================== ================================================== ===
Can Anyone tell me solution for this problems because i am beginner. So tell please me guys i need HELP


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