One or more features has an invalid polygon. Please correct the vector polygon file and submit the request again.

[sroy0211]

Hello, I am the data for my research purpose. I have used the 4 files in the Survey-of-India-Index-Maps folder which has the Boundaries folder which contains four files India-States .dbf,.prj,.shp,.shx files. I have uploaded these 4 files in zip file. Now, when I upload a zip file to a website, there is an issue: one or more features have an invalid polygon. Please correct the vector polygon file and submit the request again. Kindly help me in this regard as I am doing my academics project on this data.