[Bug] Poblem while opening DWSIM application

[unnimayavi]

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Describe the bug
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To Reproduce

PLEASE ATTACH THE ZIPPED FLOWSHEET FILE and/or inform the steps to reproduce the behavior:

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2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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Screenshots
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Desktop (please complete the following information):

• OS: [e.g. Windows, Linux, macOS]
• Version [e.g. v6.4.1]

Additional context
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