各位大佬，现想利用fe中的block couple方法耦合求解，需要耦合的项是laplacian项，但是现在fe5.0中没有该方法，于是我自己添加。一顿操作后，编译遇到如下问题，始终没能定位问题出在哪，求大佬指导一二。

In file included from /home/dong/foam/foam-extend-5.0/src/foam/lnInclude/PtrList.H:315,
from /home/dong/foam/foam-extend-5.0/src/foam/lnInclude/List.C:30,
from /home/dong/foam/foam-extend-5.0/src/foam/lnInclude/List.H:291,
from /home/dong/foam/foam-extend-5.0/src/foam/lnInclude/labelList.H:36,
from /home/dong/foam/foam-extend-5.0/src/foam/lnInclude/Pstream.H:43,
from /home/dong/foam/foam-extend-5.0/src/foam/lnInclude/OPstream.H:35,
from /home/dong/foam/foam-extend-5.0/src/foam/lnInclude/parRun.H:35,
from /home/dong/foam/foam-extend-5.0/src/finiteVolume/lnInclude/fvCFD.H:4,
from pbFourEqnsTwoPhaseFoam.C:43:
/home/dong/foam/foam-extend-5.0/src/foam/lnInclude/PtrList.C: In instantiation of ‘Foam::PtrList<T>::PtrList(const Foam::PtrList<T>&) [with T = Foam::CoeffField<double>]’:
/home/dong/foam/foam-extend-5.0/src/foam/lnInclude/FieldField.C28: required from ‘Foam::FieldField<Field, Type>::FieldField(const Foam::FieldField<Field, Type>&) [with Field = Foam::CoeffField; Type = double]’
/home/dong/foam/foam-extend-5.0/src/foam/lnInclude/BlockLduMatrix.C:84:28: required from ‘Foam::BlockLduMatrix<Type>::BlockLduMatrix(const Foam::BlockLduMatrix<Type>&) [with Type = double]’
/home/dong/foam/foam-extend-5.0/src/finiteVolume/lnInclude/BlockLduSystem.C:99:24: required from ‘Foam::BlockLduSystem<blockType, sourceType>::BlockLduSystem(const Foam::BlockLduSystem<blockType, sourceType>&) [with blockType = double; sourceType = double]’
pTEqn.H:73:70: required from here
/home/dong/foam/foam-extend-5.0/src/foam/lnInclude/PtrList.C:54:18: error: invalid conversion from ‘Foam::Field<double>’ to ‘Foam::CoeffField<double>’ [-fpermissive]
54 | ptrs_[i] = (a[i]).clone().ptr();

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