problem regarding creating an object from QProblem class

[sinatz]

Hello,

when the compiler wants to create an object from QProblem class in this line : QProblem example(2,1); which is used in most of the examples, I get this error :

undefined reference to `qpOASES::QProblem::QProblem(int, int, qpOASES::HessianType).

moreover it also shown:

'example' is ambiguous '
Candidates are:
QProblem(int, int, enum qpOASES::HessianType)
QProblem(int, int, enum qpOASES::HessianType, enum qpOASES::BooleanType)

Could you please inform me what is the problem ?

Thanks in advance.