Not all cars support all the standard Mode 01 OBD2 parameters. While newer cars often support a wide range, this can lead to confusion as you may request e.g. Vehicle Speed - and get no data back.
You'll be able to spot this as you'll have a lot of "7df" request ID messages - but no corresponding "7e8" responses.
Luckily, you can check what Mode 01 parameter IDs are supported for OBD2 in your car.
You do this by configuring your CLX000 to request the "Supported PIDs" parameters the first time you log data from your vehicle. These PIDs have ID 00, 20, 40, 60, 80, A0 and C0 - which you can select in CANvas.
You can download a pre-made configuration file (config.xml) that you can load in CANvas HERE. Note that it's set up for a CL2000, though this can quickly be adjusted to match your logger using CANvas.
This will send a "single-shot" request for these PIDs with a small delay between each. Once you've recorded this data, you can take the log file and convert it via CANvas' built-in OBD2 conversion rules. The resulting output will be a list of all the Mode 01 PIDs with a boolean value, telling you if the PID is supported or not.
Based on this, you can then update your transmit list in CANvas to only request valid PIDs.
Note on CAN bus vs. other OBD2 protocols: OBD2 can be based on five different protocols. The most commonly used is CAN bus, as it's been made mandatory in USA for cars produced after 2008. As a result, CAN is also used in most vehicles produced outside USA since 2008, but not consistently so. If your car is produced outside USA or before 2008, it is not necessarily possible to record OBD2 data via the CLX000 (as it supports only CAN bus). Often you can check the protocol via the OBD2 connector pins