[MiKTeX] Latex error "Missing \endcsname inserted"

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Hi,
I am using the latest Miktex 2.6 and LyX 1.5.3.
When I try to compile my document I get an error "Missing \endcsname
inserted." and "TeX capacity exceeded, sorry [input stack size=5000]".
I am totally unfamilar with LateX, so I would appreciate any hints what
to do now. I also tried to truncate the document, but it does not help.
The LateX protocol says "No file <mydocument>.aux", but I don't know if
this is relevant.
I added the protocol file below.

bye,
Falk Sticken

This is pdfTeX, Version 3.141592-1.40.4 (MiKTeX 2.6) (preloaded
format=latex 2008.1.8) 8 JAN 2008 12:36

entering extended mode

**Objekterkennung_mit_der_Scale_Invariant_Feature_Transformation.tex

(Objekterkennung_mit_der_Scale_Invariant_Feature_Transformation.tex

LaTeX2e <2005/12/01>

Babel <v3.8h> and hyphenation patterns for english, dumylang,
nohyphenation, ge

rman, ngerman, french, loaded.

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Document Class: scrartcl 2007/12/24 v2.98 KOMA-Script document class
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Package: scrkbase 2007/12/24 v2.98 KOMA-Script package (basics and
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Package: keyval 1999/03/16 v1.13 key=value parser (DPC)

\KV@toks@=\toks14

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Package: scrlfile 2007/12/18 v2.98 KOMA-Script package (loading files)

Package scrlfile, 2007/12/18 v2.98 KOMA-Script package (loading files)

Copyright (C) Markus Kohm

))

Class scrartcl Info: File `size11.clo' used to setup font sizes on input
line 9

10.

("C:\Programme\MiKTeX 2.6\tex\latex\base\size11.clo"

File: size11.clo 2005/09/16 v1.4f Standard LaTeX file (size option)

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Package: typearea 2007/12/24 v2.98 KOMA-Script package (type area)

Package typearea, 2007/12/24 v2.98 KOMA-Script package (type area)

Copyright (C) Frank Neukam, 1992-1994

Copyright (C) Markus Kohm, 1994-

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Package typearea Info: These are the values describing the layout:

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(Font) OMS/cmsy/m/n --> OMS/lmsy/m/n on input line 15.

LaTeX Font Info: Overwriting symbol font `largesymbols' in version `normal'

(Font) OMX/cmex/m/n --> OMX/lmex/m/n on input line 16.

LaTeX Font Info: Overwriting symbol font `operators' in version `bold'

(Font) OT1/cmr/bx/n --> OT1/lmr/bx/n on input line 17.

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LaTeX Font Info: Overwriting symbol font `symbols' in version `bold'

(Font) OMS/cmsy/b/n --> OMS/lmsy/b/n on input line 19.

LaTeX Font Info: Overwriting symbol font `largesymbols' in version `bold'

(Font) OMX/cmex/m/n --> OMX/lmex/m/n on input line 20.

LaTeX Font Info: Overwriting math alphabet `\mathbf' in version `normal'

(Font) OT1/cmr/bx/n --> OT1/lmr/bx/n on input line 22.

LaTeX Font Info: Overwriting math alphabet `\mathsf' in version `normal'

(Font) OT1/cmss/m/n --> OT1/lmss/m/n on input line 23.

LaTeX Font Info: Overwriting math alphabet `\mathit' in version `normal'

(Font) OT1/cmr/m/it --> OT1/lmr/m/it on input line 24.

LaTeX Font Info: Overwriting math alphabet `\mathtt' in version `normal'

(Font) OT1/cmtt/m/n --> OT1/lmtt/m/n on input line 25.

LaTeX Font Info: Overwriting math alphabet `\mathbf' in version `bold'

(Font) OT1/cmr/bx/n --> OT1/lmr/bx/n on input line 26.

LaTeX Font Info: Overwriting math alphabet `\mathsf' in version `bold'

(Font) OT1/cmss/bx/n --> OT1/lmss/bx/n on input line 27.

LaTeX Font Info: Overwriting math alphabet `\mathit' in version `bold'

(Font) OT1/cmr/bx/it --> OT1/lmr/bx/it on input line 28.

LaTeX Font Info: Overwriting math alphabet `\mathtt' in version `bold'

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Package: babel 2005/11/23 v3.8h The Babel package

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* Local config file bblopts.cfg used

*

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File: bblopts.cfg 2006/07/31 v1.0 MiKTeX 'babel' configuration

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Language: ngermanb 2004/02/20 v2.6m new German support from the babel system

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File: babel.def 2005/11/23 v3.8h Babel common definitions

\babel@savecnt=\count88

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\l@naustrian = a dialect from \language\l@ngerman

Package babel Info: Making " an active character on input line 92.

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No file Objekterkennung_mit_der_Scale_Invariant_Feature_Transformation.aux.

LaTeX Font Info: Checking defaults for OML/cmm/m/it on input line 23.