[ndtrong]

Hi everyone,
I am facing a problem with declaration of interface's curvature.
From calculation of K_ in interFoam following the link:
/src/transportModels/interfaceProperties/interfaceProperties.C

K_
(
IOobject
(
"interfaceProperties:K",
alpha1_.time().timeName(),
alpha1_.mesh()
),
alpha1_.mesh(),
dimensionedScalar("K", dimless/dimLength, 0.0)
)


I want to declare a new method to compute interface's curvature (C_) as follows:


C_
(
IOobject
(
"C",
psi_.time().timeName(),
psi_.mesh()
),
psi_.mesh(),
dimensionedScalar("C", dimless/dimLength, 0.0)
)

with psi is a variables of level set function, computed by value of alpha1.
However, when I build a new library, the compiler shows errors like this:
no matching function for call to Foam::...
as shown in the attached file.


Could you please help me to explain what kind of error I got and how can I resolve it?