Ofbiz 16 create a plugin and install a plugin

[Wissal]

Hello
I get a problem when using ofbiz 16  when creating a pliging the file ofbizUILAbel can't be foud on local
And i have an other issue i want to use the plugin BIRT but i can't generate the report i think the problem is with the installation of the plugin because i delete a file named email he return a problem when i want to load and start ofbiz
Plz i need help

Thank you