error JHtml: :bootstrap in version 4.5.0

I get the error JHtml: :bootstrap file not found.
Did I install a wrong version?

Have Joomla 2.5.16 on my local machine and the following sermonspeaker versions:
Latest Sermons Website Module 4.5.0 15-03-2013
Search - SermonSpeaker Website Plugin 4.5.0 15-03-2013
SermonSpeaker Beheergedeelte Component 4.5.8 14-11-2013
SermonSpeaker LanguagePack - nl-NL Website Bestand 2014-02-13-10-19-43 13.02.2014
Xmap - SermonSpeaker Plugin Website Plugin 4.4.2 Mar 2012

I See I posted in the wrong cagetory, sorry, perhaps you can move it?

Moved it.

Can you check which of the modules and plugins it is? Just disable them all and try enabling them one after each other and see which ones generates the error.

JHtmlBootstrap would be a class which is only available in Joomla 3.0. So it may be that something slipped back into the 4.5 release or so.

Found out what it triggered I think.
See the attatched file.

Under Preken overzicht (the first item) I did not use the standard option, but something else.
I put it back to the standard option and now it works again.

Ah, did you maybe select one of the "Protostar" layouts? Then that would explain it. Those only work with Joomla 3.x.