Packaging Error On Android

Hi Samantha and other friends. I tried building my project for android on my computer. I tried a third Person Blueprint and followed the mobile development documentation and it worked for me. Since that day, i always get errors when packaging for android. i think i messed up my android sdk when configuring it for android studio yet my sdk are set up in unreal engine

. Please attach is my log file.Please help me out. [link text][2]