@Preben Alsholm 

That's fantastic. It works now. Thanks a lot. The coding is not yet over. Anyway, I think the current problem is solved thanks to you.

@Markiyan Hirnyk 

Sorry Markiyan. I am a novice with Maple. I am trying to find inverse laplace transform using Iseger's algorithm. I have provided the link to my maple file now. Thanks for your help.

IsegerAlgoTrial2.mw