Error "the application is in break mode"

Hi, my application some times starts without any problem but some times it gives me an error message.
I don't understand how to resolve this. Please see two attached pictures. One with error message and another with my code.
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mastiSoftAsked:
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MishaProgrammerCommented:
I can get this  error because, if you had a few  reference on assemblies mismatched between x64 and x86.
Is there inner exception? Can you post it here?
Also try to add this code to your App.config :
<configuration> <startup useLegacyV2RuntimeActivationPolicy="true" /> </configuration>

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Also try to delete reference on WPFRuleControl and add it again and rebuild your project.
Are you surem that you don`t  forget to add reference on this library?
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mastiSoftAuthor Commented:
Hi again Misha ).
It seems to be working with line added to App.config. I'll test a  bit more tomorrow , before I close this question.
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mastiSoftAuthor Commented:
Hi again. adding line to App.config didn't help but you told me about mismatching of two users controls . That was the problem I created them with different Framework versions. When I rebuild both to the same version as an application the problem was resolved. Thank you .
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MishaProgrammerCommented:
Glad to help you!
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