I solve the problem by adding the missing files in the build folder root, I discover that the tools can't copy this file to the buils folder, this files are :

log_output.html

main.html

offline_api_wrapper.js

imsmd_rootv1p2p1.xsd

imsmanifest.xml

imscp_rootv1p1p2.xsd

ims_xml.xsd

And now every thing is fine, i hope this could help

thanks

khaled