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Problem:

java.lang.IllegalStateException: Unable to create the default expression parser for Spring Web Flow: Neither a Unified EL implementation or OGNL could be found.
(...)
Caused by: java.lang.ClassNotFoundException: ognl.Ognl
(...)

Solution: add this dependency to your pom.xml (or download the library manually of you are not using maven)

    <dependency>
      <groupId>ognl</groupId>
      <artifactId>ognl</artifactId>
      <version>2.6.9</version>
    </dependency>