Problem:
The error message "Cannot access the node with id -1: node handle is not valid" in Machine Simulation typically occurs when the software tries to access a node or object in the simulation, but the node ID provided (in this case, -1) is not valid.
In this case, the software is trying to access a node handle (a reference to a node) that is not valid, either because it is corrupted, invalidated, or out of scope.
Solution:
To solve this problem, the Module Works folder from the Registry Editor,
Computer\HKEY_CURRENT_USER\Software\SolidCAM\SolidCAMxxxx\Simulation needs to be removed
