hi everybody,
i have put angle leg support of height 3 m. but pvelit cant calculate the calculation above 2300mm of support height...so is that the problem of pvelite or 2300 mm height of angle support is the maximum range?

There is no such limitation in PV Elite;- most likely there is an error with the input data.
gr2vessels

This may be due to Eigen solver used to compute the natural frequency of the vessel. You can switch from eigen solver to the Freese (also known as Rayleigh-Ritz) method from Tools menu -> Configuration -> un-check "Use EigenSolver".

Try it out and let us know.