Android : file error Caused by: libcore.io.ErrnoException: open failed: ENOENT (No such file or directory) -

i have stored file external storage , read / write operation file. file created, , data stored every time encounter exception :

• java.io.filenotfoundexception: /storage/sdcard0/info.dcini: open failed: enoent (no such file or directory)
• caused by: libcore.io.errnoexception: open failed: enoent (no such file or directory)

my code :

try  {     stringbuilder stringbuilder = new stringbuilder();     string line;     file rootfile = environment.getexternalstoragedirectory();     rootfile.mkdirs();     file file = new file(rootfile.getabsolutepath(), master_file_name);     bufferedreader in = new bufferedreader(new filereader(file));     while ((line = in.readline()) != null)             stringbuilder.append(line);     return stringbuilder.tostring(); } catch (exception e)  {     e.printstacktrace();     return null; } 

can point out why exception there ?

edit :

the code creates file , write file :

try  {     file rootfile = environment.getexternalstoragedirectory();     rootfile.mkdirs();     file file = new file(rootfile.getabsolutepath(), master_file_name);     filewriter out = new filewriter(file);     out.write("my string data");     out.close(); } catch(exception e)   { }