We are having the Reports component in both EJ1 and Bold Reports products. So, if you referring the common web.all.min.js then Report Viewer conflict with EJ and Bold Reports product. So you can specify the component script instead of referring the web.all.min.js script in your application when using the EJ1 component along with the Bold Reports component.
For example, if you want to use the EJ1 Gird item along with BoldReports Report Viewer component then you can specify the ej.grid.min.js. You can find the following example for your reference.
<script src="https://cdn.boldreports.com/external/jquery-1.10.2.min.js" type="text/javascript"></script>
<script src="https://cdn.boldreports.com/2.2.32/scripts/common/bold.reports.common.min.js"></script>
<script src="https://cdn.boldreports.com/2.2.32/scripts/common/bold.reports.widgets.min.js"></script>
<!--EJ1 Grid component script reference.-->
<script src="https://cdn.syncfusion.com/18.1.0.42/js/web/ej.grid.min.js"></script>
<!--Bold Reports Report Viewer component script-->
<script src="https://cdn.boldreports.com/2.2.32/scripts/bold.report-viewer.min.js"></script>