How to fix matlab error?

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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',