I suspect you are doing something wrong in the template but with the information you supplied (for example without the full screenshot of the slide with the issue) it is not possible to go ahead with the analysis.
I suggest you to open a support ticket. Include the template, the complete log files (not just a piece of one of them) and the steps to reproduce the issue.
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There may also be some specific attributes in your custom template or your customer template itself may be corrupted.
I suggest the following:
1. recreate your report entirely without using your custom template and adding your chart objects two or three at a time. This will allow you to determine if any individual chart objects are problematic.
2. make sure you are not using headers and footers especially typing NP tags into the headers and footers as this is not supported.
Give this a try and let us know how it goes.
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