Solution
This error can occur for multiple reasons. One of those is if you are using a multi-segment chassis and have cards in two different segments. Multi-segment chassis have independent PCI buses for each segment that are not connected to one another by default. To fix this, you can either move the cards that you are trying to synchronize into the same chassis segment or
route the trigger between the segments using NI MAX. The error can also occur if you are using an MXI interface and NI-MAX has not detected the chassis properly. In this situation, since the chassis is not detected, NI-MAX doesn't know how to route the triggers. In order to solve this, follow our documents that troubleshoot MXI connections. For example,
MXI-Express Compatibility and Connectivity Troubleshooting Guide.