??? Error using ==> save Unable to write file No such file or directory.

I got this error when i run my simulation on my laptop but on my computer at university it works well and save file. even if i set my directory to dropbox it does not save my file

??? Error using ==> save
Unable to write file work_space_20-Apr-2013_18_19_31\LTE_2x2_it=1 it=2 it=3
it=4_EPA_rel1_20-Apr-2013_18_19_31_-8dB: No such file or directory.

Error in ==> LTE_DL_UL_simulator_main_SFBC_ULA_it at 587
    save(filename);

here is the code

if(index == 1)
        % To Save the work space for each SNR value
        dir_name1 = strcat('work_space_',date,'_',datestr(now,'HH_MM_SS'));
        mkdir(pwd,dir_name1);
    end

      filename = strcat(dir_name1,'\LTE_',num2str(Nt),'x',num2str(Nr),'_',label_iter,'_EPA_','rel1','_',date,'_',datestr(now,'HH_MM_SS'),'_',num2str(SINR_dB(index)),'dB');
      save(filename);

can anyone help why it does not create file in dropbox and in my laptop... although it create the empty folder dir_name1.

[Walter Roberson]

Which OS are you using on your laptop? Which OS are you using on your computer?

If you shorten label_iter to something like "it=1_4" then does it start working? How about "it1_4" without the "=" ? And how about if you use the longer label_iter but with the spaces replaced by underscore ?