RE: I change the BLE SDK temelate example using this https://www.novelbits.io/smart-ble-lightbulb-application-nrf52/. In this I added 1 Custom service and 2 charactersitc. After compiling and running this got below logs. [15:49:53:841]

awneil — Wed, 15 Jan 2020 12:59:49 GMT

Please don't put the entire question in the title!

https://devzone.nordicsemi.com/nordic/backstage/f/backstage-forum/40080/forum-issue-ask-a-question-is-misleading

The log you posted tells you exactly what to do:

[quote userid="86647" url="~/f/nordic-q-a/56574/i-change-the-ble-sdk-temelate-example-using-this-https-www-novelbits-io-smart-ble-lightbulb-application-nrf52-in-this-i-added-1-custom-service-and-2-charactersitc-after-compiling-and-running-this-got-below-logs-15-49-53-841"]Change the RAM start location from 0x20001FE8 to 0x200025F0[/quote]

and

[quote userid="86647" url="~/f/nordic-q-a/56574/i-change-the-ble-sdk-temelate-example-using-this-https-www-novelbits-io-smart-ble-lightbulb-application-nrf52-in-this-i-added-1-custom-service-and-2-charactersitc-after-compiling-and-running-this-got-below-logs-15-49-53-841"]Maximum RAM size for application is 0x3DA10[/quote]

That is an independent 3rd-party site - nothing to do with Nordic.

You need to contact them for support with their code - and to report any errors/omissions

https://www.novelbits.io/contact/

Others have posted comments on that article, and got replies & support from the author.

The article Prerequisites refer to "a previous post" - did you study that ... ?