Given the error "EndTrigger: Invalid operation: [enumVal] & [bool]" my first guess is that the 'SVS Duct Temperature' attribute's snapshot value at the evaluation time (4/27/2018 11:32:06 AM) either has the "Questionable" flag set or a bad value such as a System Digital State (e.g. 'No Data'). The error is saying it can't compare an enumeration (such as a System Digital State) with a boolean data type value. If you go to the Attributes tab for the example element BOF\Vessel 7 and right click 'SVS Duct Temperature' > Time Series Data, does the snapshot value have the questionable flag icon or the exclamation point indicating it's a system digital state? If the event has the questionable flag set but is numeric, then you could use the workaround in Known Issue 26428 - PE treats questionable values for PI tags as bad values to wrap it in a function like Float('SVS Duct Temperature') instead in your Analysis.
Thank you for your response. Yes. I checked the value at evaluation time and there wasn't any value recorded at that time since its recorded in increments of 5 seconds. So, basically, there was no data, that's why it was giving me the error.
Thank you again for your help.