Unable to Restore the Backup File in PgAdmin4

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I have been using "PgAdmin 4" and i am unable to restore the backup file. it
gives me an error "object of type 'bool' has no len() pgadmin restore"
My Log file detail is given below : 

2018-08-01 11:06:38,943: ERROR    pgadmin:    object of type 'bool' has no len()
Traceback (most recent call last):
  File "C:\Program Files\PostgreSQL\10\pgAdmin
4\web\pgadmin\tools\restore\__init__.py", line 327, in create_restore_job
    *args
  File "C:\Program Files\PostgreSQL\10\pgAdmin
4\web\pgadmin\tools\restore\__init__.py", line 84, in __init__
    if arg and len(arg) >= 2 and arg[:2] == '--':
TypeError: object of type 'bool' has no len()
2018-08-01 11:08:58,861: ERROR    pgadmin:    object of type 'bool' has no len()
Traceback (most recent call last):
  File "C:\Program Files\PostgreSQL\10\pgAdmin
4\web\pgadmin\tools\restore\__init__.py", line 327, in create_restore_job
    *args
  File "C:\Program Files\PostgreSQL\10\pgAdmin
4\web\pgadmin\tools\restore\__init__.py", line 84, in __init__
    if arg and len(arg) >= 2 and arg[:2] == '--':
TypeError: object of type 'bool' has no len()


Thanks 



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