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There can be multiple issue with this. The one’s I have encountered are:
1) If your script is using any PATH variable from system then that has to be added to crontab manually.
2) You should add a relative path to your script to run.
3) Crontab entry should always have a newline at the end of the file.
These are all I thing I have come across as errors while using crontab.
Hope this might help you.
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