python - Fatal error! failed to execute script when creating executable file -

i'm trying make python program run on other systems without python installation. made use of tkinter create gui, after creating exe file pyinstaller throws fatal error "failed run script". i've checked code several times , works well. don't know what's wrong.

create file using -f switch , run command line. should see actual error.

build: pyinstaller -f your_script.py run: c:\some_dir\dist\your_script.exe 

i have run issues when module in directory lowercase , pyinstaller looking uppercase first character. e.g. c:\python27\lib\site-packages\queue vs c:\python27\lib\site-packages\queue