After the tests, removing one by one of the extensions, I found that the extension that was conflicting with the Kodular FTP component is DateTools.
How does DateTools conflict with FTP ??
I think it is not the extension itself, but blocks of this extension related with ftp, which were used wrong.
I can’t explain it technically, but as I explained above, I was removing one by one of the extensions and only when I removed DataTools did FTP work, that is, the application was not closed when I called FTP.
I did the following experiment to not make a mistake in the statement. I repeated the blocks in a project without DataTools and it worked. Therefore, the FTP blocks were all correct.
Statement from the developer
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Hi @Hossein (if you don’t mind)
Does FTP component use Apache Commons Net lib? 
Can you show how you are using DateTools? @ledumelo
Boban,
I had read this post, but it didn’t work.
Can you send me an example apk? Either here or in PM.
I sent the block in the post above. But, I stopped using DateTools in my project, I prefer to test it a little more before using it.
Ohh…ok 
Send me an old apk if possible.
I will provide, but would have another way of sending without the “aia” being public?
I think there is some misunderstanding.
I am asking for apk and not for aia.
Sunny, my apologize for not being able to send the apk, as I would have to send logins and passwords and a step by step to get to the error location. Would it help if I sent a video of the version where the error was occurring?
Yes, it does.
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Thank you.
If so then @ledumelo is right. My extension can conflict with FTP component because both use same lib (although extension uses customized jar).
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It uses the library to get epoch timestamp from NTP Server.
Aren’t you able to get it without that library?