I used Helios Service Release 2 for android.
I think if you follow the following steps you wont face any error.
step#1 Right click on project package from left side.
step#2 Click Export then select export android application and click next.
step#3 keep the project name default selection.
step#4 Select “Create new keystore” radio button and click browse for location.
step#6 After selecting location, enter password(any password)..then click on Next.
step#7 In Key Creation step Enter data (you can use information as i used or by yourself)and click on Next
step#8 Select Destination location and APK file name(you can use the default apk file name or change it with .apk extension),
Step#9 after that click Finish, that will take a while and close the window.
—-Here your apk file is created as desired location—–
Note: for avoiding file repeating error you can use different location to save the “make” and “apk” file. FYI in step#5 “make” file is created and in step#8 the “apk” file is created.