QtIFW errors during uninstallation "Error during uninstallation:" if addElevatedOperation without UNDO step.

[Roman2403]

I have a problem, on uninstall process, i get errors with "Error during uninstallation: " with empty description.

I think, it happens because "addElevatedOperation" must have both DO and UNDO steps(but i dont know how to add UNDO step of env. variable for uninstallation)
DO on installation step, UNDO on uninstall. Does anyone know how to solve this problem?

Component.prototype.createOperations = function()
{
   component.createOperations();
   if(installer.isInstaller())
   {
    component.addElevatedOperation("EnvironmentVariable","GST_PLUGIN_PATH", gstPluginPath, persistently, false);
    component.addElevatedOperation("EnvironmentVariable","GST_PLUGIN_SYSTEM_PATH", gstPluginSystemPath, persistently, false);
    component.addElevatedOperation("EnvironmentVariable","GSTREAMER_1_0_ROOT_X86", gstreamerRootPath, persistently, false);
   }

If i comment this three "addElevatedOperation", then uninstall process will be successful.

[Roman2403]

I found in sources of QtIFW class EnvironmentVariableOperation, that implement functions "performOperation" and "UndoOperation" for installation and uninstallation steps, but still not clear why errors appear