 Welcome back to the session on latex. In this session, we will not learn any new latex commands, rather we will deliberately make some mistakes which can occur very often while we write latex code and we shall solve them one by one. There is nothing to get scared of when one sees an error, it is just a way of telling us that something is not right. Some common reasons for encountering an error are package not included, environment is not defined, mismatch of curly braces, etcetera, etcetera. So, what is it that we need to look for when we encounter an error? The first is the error message and the second is the line number, so that we can pinpoint the location easily. I am sure that you all realized where the error was, why? Because we encountered this error in our earlier sessions as well. So, what is the error? Talking control sequence chapter and the reason is that the chapter is not defined in our article class. Well, enough of talking, let us make some errors and resolve them. I am switching to text studio. I have written some dummy text here, document class article, begin document, end document. Now let us write begin landscape and end landscape, slash begin landscape, some content and end landscape. Let us build and run, we have an error, environment landscape not defined. What does that mean? Latex tells us that the package is not defined in our document class. So, let us add the package slash use package, do you know which one? Yes, elsecape, we build and run, yes, we resolve the error. Well, now instead of elsecape, let us write elsecapes, just deliberately making some mistake in the package name. Build and run, there is the error, elsecapes dot st y not found. Well, this could either mean that you have an error in the spelling of your package or the package really exists, but it is not installed. Let us rectify it and we build and run, we resolve the error. Now let us delete the curly brace from elsecape. We build and run, it says file ended, while scanning use of slash begin. It is also known as a runaway argument, let us build and run after rectifying it. Now, we begin the environment called landscape, but let us end it with some other environment called multi calls. We build and run, there are 2 errors on line 6 and line 7, what does it state? Begin landscape on input line 4 ended by slash end multi calls. So, we rectify it with the correct environment, we build and run. It is best advised to build and run your documents frequently. This way if there is an error, you will be able to resolve it easily. In case you could not build frequently and the document is too large, then you can write slash end document at regular intervals, so that latex limits the text to be built. Now let us see. Say for example, you have 2, 3 begin landscape and end landscapes, let us indent it for better readability and we make some mistakes here, build and run. We have got some mistakes, assume that the document is too large and you have found an error here. There is no line number also, but of course, we can see that the text is highlighted in red color. So, we just come here and we say slash end document, we build and run, so we know that there is an error here, we just come enclose it, build and run, so there is no error. So, now we come here, we delete the end document from here, we paste it here, we again build and run, this way we resolve the errors one by one. Now, let us go back to our slides. The different errors that we resolved are mentioned here for easy reference, package not included, style file not found, missing or mismatch in curly brace, environment not ended or mismatch, so now you can read the errors, identify and resolve them. Thank you, have a nice day.