Using ComplexSolver in Eigen - c++

Question

I'm trying to use Eigen3 to compute some complex eigenvalues and sofar everything worked, but know I get a weird error:
g++ -I/usr/include/eigen3/ -Icubature/ -I/usr/include/boost/ cubature/hcubature.c main.cpp wavefunction.cpp -o main.x
main.cpp: In function ‘int main(int, char**)’:
main.cpp:103:2: error: ‘ComplexEigenSolver’ was not declared in this scope
ComplexEigenSolver<MatrixXcd> ces;
^~~~~~~~~~~~~~~~~~
main.cpp:103:2: note: suggested alternative:
In file included from /usr/include/eigen3/Eigen/Eigenvalues:35:0,
from /usr/include/eigen3/Eigen/Dense:7,
from main.cpp:4:
/usr/include/eigen3/Eigen/src/Eigenvalues/ComplexEigenSolver.h:45:38: note: ‘Eigen::ComplexEigenSolver’
template<typename _MatrixType> class ComplexEigenSolver
^~~~~~~~~~~~~~~~~~
main.cpp:103:30: error: expected primary-expression before ‘>’ token
ComplexEigenSolver<MatrixXcd> ces;
^
main.cpp:103:32: error: ‘ces’ was not declared in this scope
ComplexEigenSolver<MatrixXcd> ces;
^~~
make: *** [Makefile:2: all] Error 1
Here are my includes:
#include <iostream>
#include <vector>
#include <Eigen/Core>
#include <Eigen/Dense>
#include <Eigen/Eigenvalues>
#include "wavefunction.cpp"
#include "cubature.h"
using Eigen::MatrixXcd;
This is the routine where the error occurs:
MatrixXcd hop(5,5);
for(int m1 = -2; m1 <= 2; m1++){
for(int m2 = -2; m2 <= 2; m2++){
hop(m1+2, m2+2) = ....;
}
}
ComplexEigenSolver<MatrixXcd> ces;
Everything works fine, only the last line doesn't work. I don't see the difference between my code and the example given at the Eigen website.
What am I doing wrong?