simscape electronics reference node error

it is showing "dependency found among topology euation .check for reference node",in my circuit drawn below .and when i am trying to connect ground or groundneutral than i am getting red line instead of black solid line.

Answer 1

[Sabin]

The blocks are belonging to two different technologies, Simscape and Specialized Power Systems. It is better to use a single technology. There are similar bloks in both technologies. In Simscape the ground is called 'Electrical Reference'.