For info on the errors:

$ oerr ORA 01406
01406, 00000, "fetched column value was truncated"
// *Cause:
// *Action:

$ oerr ORA 24345
24345, 00000, "A Truncation or null fetch error occurred"
// *Cause:  A truncation or a null fetch error"
// *Action: Please ensure that the buffer size is long enough to
//          store the returned data.
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