Legato app running- no output

I am trying to run Source_File_98.adef which is flashed into mangOH yellow board. but it is not shoinwg output after i run logread -f | grep Source_File_98

Could you please tell me the reason and how to resolve this
@jyijyi

you can try

logread -f &

app restart Source_File_98

Thank you so much!

Your suggestion and below commands helped me to see the app output

logread -f

logread | tail -10

app restart Source_File_98

logread | tail -20