How to fix matlab error?

Error using fclose
Invalid file identifier. Use fopen to generate a valid file identifier.

Error in nc_interface (line 98)
fclose(fid);

HI,
I have faced this error when making heat flux. please help me.

Error in nc_getatt (line 61)
[method,~,~] = nc_interface(ncfile);

Error in nc_inq (line 69)
A = nc_getatt(ncfile); % NetCDF file global attributes

Error in nc_read (line 77)
Info = nc_inq(ncfile);

Error in d_ecmwf2roms (line 296)
lon = nc_read(InpFile, ‘longitude’,