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how to use Sample utility on surfaceField

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Old   October 25, 2020, 23:42
Default how to use Sample utility on surfaceField
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Hi everyone,

I used sample utility for volScalarField without any problem.
However when I use it on volScalarField data today, the field data is not being process and the std output is "Reading fields: surfaceScalarField: Eflux" and "No fields to sample", which confused me.
I tried to change interpolationScheme from cellPoint to cellPointFace but nothing changes.

Any help would be appreciated. thank you.

Std output as below.

Code:
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Overriding DebugSwitches according to controlDict
    SolverPerformance 0;

Create mesh mesh for time = 3000

Reading set description:
    data

Time = 3000

Reading fields:
    surfaceScalarField: Eflux

Executing functionObjects
No fields to sample

End
My sampleDict is as below.

Code:
FoamFile
{
  version 2.0;
  format  ascii;
  class   dictionary;
  object  sampleDict;
}

libs ("libsampling.so");
type sets;

interpolationScheme cellPointFace;
setFormat       raw;
sets
(
    data
    {
        type    uniform;
        axis    z;
        start   (0 0 0);
        end     (0 0 1);
        nPoints 50;
    }
);

fields          (  Eflux );
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