[Dopedangel]

I tried to convert 2 or more rar files to epub using batch convert first I get this error

Convert existing: The following books have already been converted to epub format. Do you wish to reconvert them?

I have never converted these files before
and then when I press no
I get this error

Traceback (most recent call last):
File "main.py", line 1221, in convert_ebook
File "calibre\gui2\tools.pyo", line 111, in convert_bulk_ebook
File "calibre\gui2\convert\single.pyo", line 98, in __init__
File "calibre\gui2\convert\single.pyo", line 131, in setup_pipeline
File "calibre\ebooks\conversion\plumber.pyo", line 479, in __init__
ValueError: No plugin to handle input format: rar


I am using the latest calibre on a Win XP machine
converting files individually works ok