Failed to LinearToFromdB in SNAP

I try to apply Linear to dB conversion on a .tiff Sentinel-1 image extracted from IDL and it appears an error. I used both graph builder and menu way (raster -> data conversion -> linear to db) but it doesn’t work…

A workaround would be using Band Maths (Raster -> Band Maths) and manually applying the formula behind the conversion:
10*log10(intensity value)

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Thank you very much. It works!

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It probably does not work because the necessary metadata is not present. Why don’t you convert to dB before using IDL?