This error occurs when panning and zooming in ARCEDIT or ARCPLOT:Object "" does not have windowed ancestor.
This is an HP-UX 11.0 CDE Windows Manager issue.
This error may also occur when adding new arcs in ARCEDIT, or in ArcTools > Edit Tools, using the "7) Square on/off" option by holding the Ctrl key and clicking the left mouse button. This error may occur under other circumstances as well.
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