Text Formatting ⇒ Inputenc error

[looreenzoo]

Dear all,
I have a problem with an inputenc error. When I attempt to build from the source, I got these 4 errors:

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!Package inputenc Error: Unicode char \u8:́ not set up for use with LaTeX.
!Package inputenc Error: Unicode char \u8:́ not set up for use with LaTeX.
!Package inputenc Error: Unicode char \u8:́ not set up for use with LaTeX.
!Package inputenc Error: Unicode char \u8:́ not set up for use with LaTeX.

I checked on the Internet and it seems that there are some special characters (sometimes also invisible characters) that produce this output, however I am not able to find and replace them. So I tried to use the utf8x option in inputenc, but now I get these 5 errors:

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! Package biblatex Error: Incompatible package 'ucs'.
! Package ucs Error: Please activate option 'combine'.
! Package ucs Error: Please activate option 'combine'.
! Package ucs Error: Please activate option 'combine'.
! Package ucs Error: Please activate option 'combine'.

Can anyone help? I know that I shouldn't say that in a support forum, but: it's pretty urgent! Thank you all in advance.

P.S. This is my preamble:

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\documentclass[12pt,a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[american]{babel}
\usepackage[babel]{csquotes}
\usepackage[authordate]{biblatex-chicago}
\bibliography{chapter1}
\usepackage{booktabs}
\usepackage{caption}
\usepackage{qtree}
\usepackage{lmodern}
\usepackage{microtype}
\usepackage{ellipsis}

EDIT: I don't know if this can help, but on the previous version of this post, this code line

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! Package inputenc Error: Unicode char \u8:́ not set up for use with LaTeX.

was not printed as in the log file, where this strange accent is right upon the colon after \u8

[localghost]

[…] P.S. This is my preamble: […]

The preamble alone is absolutely useless. For specific help it will require a complete but minimal example. Make sure that input encoding (UTF-8 here) and the encoding of the saved *.tex file accord.


Thorsten

[looreenzoo]

While preparing the minimal example, I found out the problem, which was not in the .tex file, but in the .bib one. Since the errors were reproducible even without any text, I checked my references and there was an almost invisible sign upon one author's name. I canceled it, compiled the file, and got the same errors. So I cut the \printbibliography command, compiled the file, re-pasted the command, compiled again and now everything works.
Thanks for indirectly helping!