How to fix merged SOLIDWORKS macro errors

Symptoms

SOLIDWORKS macros work correctly independently but failed to work when merged to one. Possibly, the error is displayed: Run-time error '424': Object required

Run-time error '424': Object required when running the macro

Cause

Merged macros might not be compatible
There might be required initialization from the source macro which was not copied to the destination macro
Variable naming might be different between source and target macros

Resolution

Identify which line fails
Check the state of variables. Hover the mouse and see if it is not shown as *Nothing *in the tooltip.
Make sure that the correct portion of the macro is copied
Make sure that required initialization is copied as well (if applicable)
Make sure that the variables naming is consistent