I modified the dimensions of the cavity to my requirement in the blockMeshDict file.

Then ran the blockMesh file without any errors.

But upon running icoFoam, after a certain number of successful iterations I get an error message. It is as follows,

Time = 0.075

Courant Number mean: 843.929 max: 1563.48
#0  Foam::error::printStack(Foam::Ostream&) at ??:?
#1  Foam::sigFpe::sigHandler(int) at ??:?
#2  ? in "/lib/x86_64-linux-gnu/libc.so.6"
#3  Foam::symGaussSeidelSmoother::smooth(Foam::word const&, Foam::Field<double>&, Foam::lduMatrix const&, Foam::Field<double> const&, Foam::FieldField<Foam::Field, double> const&, Foam::UPtrList<Foam::lduInterfaceField const> const&, unsigned char, int) at ??:?
#4  Foam::symGaussSeidelSmoother::smooth(Foam::Field<double>&, Foam::Field<double> const&, unsigned char, int) const at ??:?
#5  Foam::smoothSolver::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const at ??:?
#6  ? in "/opt/openfoam7/platforms/linux64GccDPInt32Opt/bin/icoFoam"
#7  ? in "/opt/openfoam7/platforms/linux64GccDPInt32Opt/bin/icoFoam"
#8  ? in "/opt/openfoam7/platforms/linux64GccDPInt32Opt/bin/icoFoam"
#9  ? in "/opt/openfoam7/platforms/linux64GccDPInt32Opt/bin/icoFoam"
#10  __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#11  ? in "/opt/openfoam7/platforms/linux64GccDPInt32Opt/bin/icoFoam"
Floating point exception (core dumped)

How can I rectify this issue?

Thanks, in advance.