What can cause these DBD::SQLite errors? [closed] - perl

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I have an application inserting data into a sqlite database. Every so often I get these errors and I don't know why.
DBD::SQLite::st execute failed: database is locked at ...
or
DBD::SQLite::st execute failed: file is encrypted or is not a database
It's doing a bunch of inserts but sometimes it fails like this.

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I have a PowerShell code which has many hash table. When i run it getting below message
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can someone please explain to mke why i get these errors? [closed]

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in one part of the code everything is ok and the next although it is the exact same thing it gives me an error
i am trying to build the MVVM of my application but i keep getting these errors

ERROR : The remote name could not be resolved: 'graph.facebook.com' Could not get access token [closed]

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the problem is each two hours the application get this error and after two hours the application will work
am new to facebook application any help will be appriciated
You are using a short term token see this page you need to extend it to a long-term token which should then last about 60 days.

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I have inherited multiple scripts in Matlab and sometimes it's tricky to trace where the execution is happening. I would like to create a log file to show where it is in the execution, show warnings and show errors and date and time stamps. [Note: I'm using Matlab R2012a].

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I am developing an IOS application for recovering deleted files.
So Can any one tell me is it possible and How?