errors in Payroll classes Symmetry dynamics ax 2012 r3

Today I was configuring POS on Azure test/dev environment, I got very strange errors during compilation  of classes node.

All these classes were belong to Payroll modules.

Error described that Symmetry variable is not declare.

Later I discover that reference of ste-net.dll is missing in AOT.

This mysterious dll (mysterious for me) is found at  C:\Program Files (x86)\Microsoft Dynamics AX\60\Client\Bin

Yu can add  its reference by right click on reference node In AOT

Click on browse and go to  C:\Program Files (x86)\Microsoft Dynamics AX\60\Client\Bin

Select

Select and click on ok

As reference is added into AOT. Compilation errors are gone.

Reference:  https://community.dynamics.com/ax/f/33/t/150222