cvx install error

Saving updated preferences…unexpected error:
Undefined function ‘cvx_save_prefs’ for input arguments of type
Error in cvx_setup (line 191)
cvx_save_prefs( ‘save’ );
Please attempt to correct this error and re-run cvx_setup. If you cannot,
you will be forced to re-run cvx_setup every time you start MATLAB.
Testing with a simple model…
UNEXPECTED ERROR: -----------------------------------------------
Undefined function ‘cvx_getdual’ for input arguments of type
Error in cvxprob/newcnstr (line 19)
dx = cvx_getdual( x );
Error in == (line 3)
b = newcnstr( evalin( ‘caller’, ‘cvx_problem’, ‘[]’ ), x, y, ‘==’
Error in cvx/abs (line 68)
{ xt, w } == lorentz( st, 0 ); %#ok
Error in cvx/norm (line 56)
cvx_optval = sum( abs( x ) );
Error in cvx_setup (line 212)
minimize( norm(A*x-b,1) );
Please report this error to support, and include entire output of
CVX_SETUP in your support request.

Are you installing CVX 2.2? If not, install that rather some other version. if you are using CVX 2.2, try reinstalling. if that doesn’t resolve things, try submitting a bug report per the section “Bug reports” at

Thank your replay, I have solved the problem change the path of cvx. I want to know where can I download the cvx2.1.

Download CVX 2.2 (not 2.1) at .