My tileset is not working

Whenever i try to use my tileset (im using construct 2 btw) it says Error parsing xml file. check if the file is a valid tiled tmx file. my file is a .png so id there a program i can use to make it tmx or what can i do?

If you're just using a png, all you have to do is open the image in the image editor of the built in tilemap object. The message you are getting comes from trying to open the file from the Tilemap bar.

Find the tilemap in the Projects panel under the Objects section and double click it. This will pull up the image editor (just like editing a sprite). From there, open your image.