The error message Wrong content node response type and other report failures can be caused by invalid applied filters or a cycle that tries to select an invalid value for the field (a value that doesn't exist in the field).
Note: By default, 'verify filter' is enforced programmatically in NPrinting 17 meaning that if a filter produces empty values in a chart, a report will not be produced and the error you will see is Wrong Content Node Type error.
Environment:
Qlik NPrinting
Example 1:
Your source contains the Year field that contains the values 2012, 2013 and 2014 but you added a filter with Year = 2015 to the report resulting in an empty data set.
Example 2:
You added to the report the filter Year = 2014 and the Country field into the Levels node. Remember that adding a field in the Levels node is like a filter. When the report is created it is possible that a value of Country has an empty data set for the year selected. For example, there are no sales in Italy in 2014. This generates the error.