Error during install

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Everytime I try to install Concrete5 I get this error message: Fatal error: Call to undefined function stream_get_contents() in /users/cpa-uelzen/www/concrete/libraries/3rdparty/Zend/Cache/Backend/File.php on line 955
And I'm sure username, password and everything else for the database was correct...

 
Mnkras replied on at Permalink Reply
Mnkras
please make sure that all files were uploaded correctly
nano91 replied on at Permalink Reply
I uploaded them several times but the result was everytime the same error code