Hi,
Line numbers of error messages in the sequence diagram are different.
In the following cases
@startuml
participant "Famous Bob" aass Bob << Generated >>
@ enduml
* Command line (said line 1)
C:\temp> java -jar plantuml.jar small.txt
Error line 1 in file: C:\temp\small.txt
Some diagram description contains errors
C:\temp>
* png (said line 2)
[From small.txt (line 2)]
@startuml
participant "Famous Bob" aass Bob << Generated >>
Thank you.