Argument 0 of... was coerced to the appropriate type and thus will not change...

Hi friends,

When I run SW_S2B01667E.20031000005-20031000147.20061182243.ncl (see
attachment) I got a warning:
Argument 0 of the current function or procedure was coerced to the
appropriate type and thus will not change if the function or procedure
modifies its value.

What is that? Do I need to care it?

The corresponding hdf file is below:
ftp://ftp.hdfgroup.uiuc.edu/pub/outgoing/veer/MAP_DATA/files/PODAAC/SW_S2B01667E.20031000005-20031000147.20061182243.hdf

Thanks a lot.

Best,
Yi Wang

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