[mysticalinc]

When I try to generate a catalogue with Calibre, I get this message:

ERROR: Conversion Error: <b>Failed</b>: Generate catalog

Generate catalog
Catalog_EPUB_MOBI:run
path_to_output: c:\users\douglas\appdata\local\temp\calibre_0.6.36 _06k8co_catalog_out.mobi
Output format: mobi
Book count: 68
opts:
basename: Catalog
catalog_title: Doug's Books
creator: calibre
descriptionClip: 250
exclude_genre: \[[\w ]*\]
exclude_tags: ~,Catalog
fmt: mobi
log: <calibre.utils.logging.Log object at 0x04DB2CF0>
note_tag: *
output_profile: kindle
plugin_path: <class 'calibre.library.catalog.EPUB_MOBI'>
read_tag: +
search_text: None
sort_by: None
verbose: True
CatalogBuilder(): Generating mobi for kindle
0.00% fetchBooksByTitle()
0.08% fetchBooksByAuthor()
0.15% generateHTMLDescriptions()
0.23% generateHTMLByTitle()
0.31% generateHTMLByAuthor()
0.38% generateHTMLByTags()
using default cover for 'Calibre Quick Start Guide'
generating new thumbnail_default.jpg
0.46% generateOPF()
0.54% generateNCXHeader()
0.62% generateNCXDescriptions()
0.69% generateNCXByTitle()
0.77% generateNCXByAuthor()
0.85% generateNCXByTags()
Python function terminated unexpectedly
list index out of range (Error Code: 1)
Traceback (most recent call last):
File "site.py", line 103, in main
File "site.py", line 85, in run_entry_point
File "site-packages\calibre\utils\ipc\worker.py", line 99, in main
File "site-packages\calibre\gui2\convert\gui_conversion.py", line 59, in gui_catalog
File "site-packages\calibre\library\catalog.py", line 2391, in run
File "site-packages\calibre\library\catalog.py", line 772, in buildSources
File "site-packages\calibre\library\catalog.py", line 1901, in generateNCXByTags
IndexError: list index out of range


ANy help would be appreciated. Thank you, mysticalinc