indices on left not compatible with size of the right

Dear Community, I am hoping somebody can advice on the error below that I keep hitting with a new code:

 Unable to perform assignment because the indices on the left side are not
compatible with the size of the right side.
Error in ms_manip (line 38)
[~, pol_lat(i), pol_lon(i)] = mf_srex(lat_mod, lon_mod, PRECT_ctl, area, island, [], srex_reg{i}); %#ok<*SAGROW>

Here is the full code the error refers to:

% get grid dimensions
[nlat, nlon] = size(lat_mod);

% get number of srex regions
nreg = length(srex_reg);

% get land pixel indices - excluding Antarctica
island                = pct_land > 50; 
island(lat_mod < -60) = 0;             % remove antarctica

% get land pixel indices - excluding Antarctica
isirr                = pct_irr > 10; 
isirr(lat_mod < -60) = 0;             % remove antarctica

% create date vectors
date_vec = datevec(datenum(time_begin):1:datenum(time_end));

% get corners of SREX regions used in this study and use them to generate srex masks
for i=1:nreg
    [~, pol_lat(i), pol_lon(i)] = mf_srex(lat_mod, lon_mod, PRECT_ctl, area, island, [], srex_reg{i}); %#ok<*SAGROW>
    issrex(:,:,i)               = inpolygon(lon_mod, lat_mod, pol_lon{i}, pol_lat{i}) & island;
end

The above code was working previously before the variable 'area' was added - but the code (with the new variable) is working fine elsewhere. The units also seem fine. Please help

[madhan ravi]

Upload your code I mean everything with all the input datas , saves time

[aine gormley]

hi, thanks - i have done that now