ERROR 4 [NRF_ERROR_NO_MEM] when connecting to nRF connect mobile application

[Msk]

I'm trying to merge the ble_Central example project with ble_app_template project. I've added 3 Custom services in the ble_app_template project by setting UUIDs and trying to send and receive data using nRF connect Mobile application. Everything works fine in with ble_app_template project alone.

When I merged it with ble central scanner project.it starts advertising and I am able to see the nRF device advertising in the nRF Connect app , however, whenever I try to establish connection with the device, it crashes and gives me ERROR 4 [NRF_ERROR_NO_MEM]. I'm using nRF52480 with SDK17.0.0. Can any one help me what causes this error.

Thanks in advance.  

[Msk]

I'm not sure which function returns this error. I've increased the RAM size accordingly when I added the custom services. The device is even advertising, the error happens only when I try to connect from the mobile app. 

The mentioned location App_Services.c:351 is this..