TwinCAT Tree Item Not Found

What does TSM_E_ITEMNOTFOUND mean?

The specified tree item could not be found using the provided identifier (0x98510001). This can occur with LookupTreeItem() (absolute path name), LookupTreeItemById() (itemType/itemId combination), LookupChild() (relative path name), CreateChild() (bstrBefore item not found), DeleteChild() (bstrName item not found), ExportChild() (bstrName item not found), or ChangeChildSubType() (bstrChild item not found).

• The specified TwinCAT variable or object identifier does not exist.
• A reference to a non-existent tag in the PLC project.
• An attempt to access a memory address that is not mapped.

Click steps to track your progress.

1. 1

   Verify the exact path name (absolute or relative), itemType, itemld, or bstrName/bstrBefore/bstrChild argument for typos or incorrect hierarchy.

2. 2

   Use the TwinCAT System Manager to visually confirm the existence and exact properties (name, type, ID, path) of the target tree item.

3. 3

   Ensure the TwinCAT configuration is correctly loaded and matches the expected structure.

4. 4

   Check for case sensitivity or leading/trailing spaces in item names if applicable.