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When taking a print of  delivery slip from Receipt occurs : "Wkhtmltopdf failed (error code: -11). Memory limit too low or maximum file number of sub process reached. Message : b'' error message. But its occurs only for a particular report only. 

We have upgraded the version of Wkhtmltopdf package from 12.1 to 12.5-1. But the issue still remain. 

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Remove wkhtmltopdf and related package. $ sudo apt-get remove libqt4-dev qt4-dev-tools wkhtmltopdf. ...
Install requirement package for compiling.
Clone from git wkhtmltopdf and qt source.
Compile qt.
Compile wkhtmltopdf.
Reboot.

Greetings,
Peter

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