errors in Payroll classes Symmetry dynamics AX 2012 R3 in complication

 After AX installation ,I got very strange errors during compilation  of classes node.

All these classes were belong to Payroll modules.

Most errors 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

We 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.