% create the computational grid

Nx = 64; % number of grid points in the x direction

Ny = 64; % number of grid points in the y direction

Nz = 64; % number of grid points in the z direction

dx = 0.1e-3; % grid point spacing in the x direction [m]

dy = 0.1e-3; % grid point spacing in the y direction [m]

dz = 0.1e-3; % grid point spacing in the z direction [m]

kgrid = kWaveGrid(Nx, dx, Ny, dy, Nz, dz);

% define the properties of the propagation medium

medium.sound_speed = 1500 * ones(Nx, Ny, Nz); % [m/s]

medium.sound_speed(1:Nx/2, :, :) = 1800; % [m/s]

medium.density = 1000 * ones(Nx, Ny, Nz); % [kg/m^3]

medium.density(:, Ny/4:end, :) = 1200; % [kg/m^3]

% create initial pressure distribution using makeBall

ball_magnitude = 10; % [Pa]

ball_x_pos = 38; % [grid points]

ball_y_pos = 32; % [grid points]

ball_z_pos = 32; % [grid points]

ball_radius = 5; % [grid points]

ball_1 = ball_magnitude * makeBall(Nx, Ny, Nz, ball_x_pos, ball_y_pos, ball_z_pos, ball_radius);

source.p0 = ball_1;

% define a series of Cartesian points to collect the data

sensor.mask = zeros(Nx, Ny,Nz);

sensor.mask(Nx/2:Nx/2+5, Ny/2:Ny/2 +5,Nz/2:Nz/2 +5) = 1;

filename = 'example_input11.h5';

% run the simulation

kspaceFirstOrder3D(kgrid, medium, source, sensor,'SaveToDisk',filename);

#######################################################################

IN COMMAND LINE:

>> kspaceFirstOrder-OMP.exe -i example_input11.h5 -o example_output11.h5

################################################## OUTPUT ####################

+---------------------------------------------------------------+

| kspaceFirstOrder-OMP v1.3 |

+---------------------------------------------------------------+

| Reading simulation configuration: Failed |

+---------------------------------------------------------------+

+---------------------------------------------------------------+

| !!! K-Wave experienced a fatal error !!! |

+---------------------------------------------------------------+

| Error: Invalid format of the input file: iostream stream |

| error |

+---------------------------------------------------------------+

| Execution terminated |

+---------------------------------------------------------------+

I can't find the solution please help me to solve it.....