Hi all,<br><br>I get these linking errors when I try to compile DeformableRegistration2<br><br>DeformableRegistration.obj : error LNK2019: unresolved external symbol &quot;protected: __thiscall itk::Statistics::DenseFrequencyContainer::DenseFrequencyContainer(void)&quot; (??0DenseFrequencyContainer@Statistics@itk@@IAE@XZ) referenced in function &quot;public: static class itk::SmartPointer&lt;class itk::Statistics::DenseFrequencyContainer&gt; __cdecl itk::Statistics::DenseFrequencyContainer::New(void)&quot; (?New@DenseFrequencyContainer@Statistics@itk@@SA?AV?$SmartPointer@VDenseFrequencyContainer@Statistics@itk@@@3@XZ)<br>
1&gt;DeformableRegistration.obj : error LNK2019: unresolved external symbol &quot;public: float __thiscall itk::Statistics::DenseFrequencyContainer::GetFrequency(unsigned long)const &quot; (?GetFrequency@DenseFrequencyContainer@Statistics@itk@@QBEMK@Z) referenced in function &quot;public: virtual float __thiscall itk::Statistics::Histogram&lt;float,1,class itk::Statistics::DenseFrequencyContainer&gt;::GetFrequency(unsigned long const &amp;)const &quot; (?GetFrequency@?$Histogram@M$00VDenseFrequencyContainer@Statistics@itk@@@Statistics@itk@@UBEMABK@Z)<br>
1&gt;DeformableRegistration.obj : error LNK2019: unresolved external symbol &quot;public: void __thiscall itk::Statistics::DenseFrequencyContainer::SetToZero(void)&quot; (?SetToZero@DenseFrequencyContainer@Statistics@itk@@QAEXXZ) referenced in function &quot;public: void __thiscall itk::Statistics::Histogram&lt;float,1,class itk::Statistics::DenseFrequencyContainer&gt;::SetToZero(void)&quot; (?SetToZero@?$Histogram@M$00VDenseFrequencyContainer@Statistics@itk@@@Statistics@itk@@QAEXXZ)<br>
1&gt;DeformableRegistration.obj : error LNK2019: unresolved external symbol &quot;public: bool __thiscall itk::Statistics::DenseFrequencyContainer::IncreaseFrequency(unsigned long,float)&quot; (?IncreaseFrequency@DenseFrequencyContainer@Statistics@itk@@QAE_NKM@Z) referenced in function &quot;public: bool __thiscall itk::Statistics::Histogram&lt;float,1,class itk::Statistics::DenseFrequencyContainer&gt;::IncreaseFrequency(unsigned long const &amp;,float)&quot; (?IncreaseFrequency@?$Histogram@M$00VDenseFrequencyContainer@Statistics@itk@@@Statistics@itk@@QAE_NABKM@Z)<br>
1&gt;DeformableRegistration.obj : error LNK2019: unresolved external symbol &quot;public: void __thiscall itk::Statistics::DenseFrequencyContainer::Initialize(unsigned long)&quot; (?Initialize@DenseFrequencyContainer@Statistics@itk@@QAEXK@Z) referenced in function &quot;public: void __thiscall itk::Statistics::Histogram&lt;float,1,class itk::Statistics::DenseFrequencyContainer&gt;::Initialize(class itk::Size&lt;1&gt; const &amp;)&quot; (?Initialize@?$Histogram@M$00VDenseFrequencyContainer@Statistics@itk@@@Statistics@itk@@QAEXABV?$Size@$00@3@@Z)<br>
1&gt;D:\study\Fall2009\ITK-VTK\Projects\DeformableRegistration\bin\Debug\DeformableRegistration.exe : fatal error LNK1120: 5 unresolved externals<br><br>Thanks and regards,<br>Subarna Ghosh.<br>