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# Rerun the installer
== Error UnsupportedClassVersionError when running TVCli ==<!--T:25-->
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The '''UnsupportedClassVersionError''' happens because the Java version in use isn't correct.
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Bellow a complete sample of the error output
<pre>
The Java used during TVCli execution is indicated by Windows [https://en.wikipedia.org/wiki/PATH_(variable)#DOS,_OS/2,_and_Windows ''PATH''] variable.
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To determine witch version of Java is pointed by PATH variable you can use the JAVA ''-version'' parameter, we will show you bellow.
# Open [https://en.wikipedia.org/wiki/Windows_Console Windows Command Console]
# Execute java asking for his version: '''''java -version'''''
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The ''-version'' parameter should output something like bellow for Java version 8
<pre>
</pre>
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If Java version is bellow 8 the ''UnsupportedClassVersionError'' is thrown. You need to install a newer version, or if a newer version is already installed, you need to [[#Configuring_Windows_PATH|correct de Windows PATH]] variable to point to newest Java.