Unity AssetPreview.GetAssetPreview not compiling

I am at the end of my patience i have tried every thing : Saving the texture before compiling

Getting the texture at runtime

Saving an asset as a material with a texture in it and then loading but all to no evail

When i try to compile the unity project to webgl i get an error saying that the assetpreview.GetAssetPreview is not a valid identifier. People have said that, that function call only works when playing in the editor i have tried importing unity editor but that is a whole other mess.

thanks in advance

what i am trying to do is get asset previews of my gameobjects at runtime