Error installing second site on ubuntu 14

Hi everyone,
Last 2 days, i setup successfully erpnext, yesterday i setup second site named htk, then this is my issue:
Traceback (innermost last):
File “/home/frappe/frappe-bench/apps/frappe/frappe/”, line 54, in application
File “/home/frappe/frappe-bench/apps/frappe/frappe/”, line 104, in init_request
frappe.init(site=site, sites_path=_sites_path)
File “/home/frappe/frappe-bench/apps/frappe/frappe/”, line 140, in init
File “/home/frappe/frappe-bench/apps/frappe/frappe/”, line 740, in setup_module_map
for module in get_module_list(app):
File “/home/frappe/frappe-bench/apps/frappe/frappe/”, line 640, in get_module_list
return get_file_items(os.path.join(os.path.dirname(get_module(app_name).file), “modules.txt”))
File “/home/frappe/frappe-bench/apps/frappe/frappe/”, line 598, in get_module
return importlib.import_module(modulename)
File “/usr/lib/python2.7/importlib/”, line 37, in import_module
ImportError: No module named htk

now i can’ t login to the first site either cause of this error
Anybody can help me, please,

Can you take me through the steps you took to reach this point?