Object: 1 named: "DP_TABLE" of type: TABLE
Script: RightMousePressed
Line: 23, Attribute "getColumnN" for "setValue()" is unknown for object "DP_TABLE" with type "TABLE"
Also there is one strange thing - i should mention column number (int) but not (string).
Use 3.15 p013 Windows.
If you want to get the text of ALL cells in a specific column to copy to the clipboard, then you have to iterate over all rows of this column and create one string out of it.
If you want to have the text only from one specific cell, then use cellValueRC.
Also, your error message shows that you used setValue for an attribute named "getColumnN" which is not writable - therefore the error.
And about the strange thing: with "getColumnN" you use an int to address the column. Other functions like cellValueRC pass the column as string.