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XMLLINT parses xml files and can give you a detailed error. 

Step-by-step guide

1. Install xmllint

   Code Block
   language bash theme RDark
   apt -y install libxml2-util

   
   

2. run that for loop with xmllint and some debug as site user and write the result to a file

   Code Block
   language bash theme RDark
   OMD[mysite]:~$ for i in $(find ~/var/pnp4nagios/perfdata/ -name "*xml"); do echo "#####$i####"; xmllint --debug --format $i; echo "#####" ;done &> xmllint.log

   
   

3. Check if we already provide a solution here:Error during the RRD conversion
4. If there is no solution, you can open a support case and provide us with the log. Then we can analyze that

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