Hi @Deepti_Prasad,
First… This was in the “Resources” category, so I am moving this to the Course 1 Week 1 category since this is about that week’s assignment.
Now, about the error:
I tried to reproduce with a fresh copy of the assignment, but everything worked fine for me.
A couple things you can try:
1). The most common situation when other students have seen this issue, it’s been solved by refreshing their workspace. Usually, this has been because they inadvertently changed the url, which you’ve already checked, but there could be other causes. See Troubleshooting tips - Refreshing your workspace for instructions.
2). Since you are getting an “incorrect type” error, another possibility might be that you did not save your work before you submitted. See Assignment Troubleshooting Tips for more info.
If you try both of these and still have an issue, you can DM me a copy of your .ipynb and I’ll take a look to see if I can find the issue.