[Interest] Failed to start Assistant, Designer...

[Igor Mironchik]

Hi guys,

I freshly install Qt 5.5.0 with online installer on Kubuntu 15.04 in the 
release day. But today I needed to launch Assistant, and it crashes...

Here is the output of Assistant:

Konsole output
igor at gmi:~/Qt/5.5/gcc_64/bin$ ./assistant
kf5.kiconthemes: "Theme tree: (Breeze)"
Cannot mix incompatible Qt library (version 0x50401) with this library 
(version
0x50500)
Aborted (core dumped)

I'm new with Linux... How can I fix it?
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