If anyone still having problems even after comparing plugins with a valid project like me, a very simple solution is to edit directly the .uproject file and remove the plugins part.
Example, i changed from this :
{
"FileVersion": 3,
"EngineAssociation": "4.11",
"Category": "",
"Description": "",
"Plugins": [
{
"Name": "WindowsDeviceProfileSelector",
"Enabled": true
},
{
"Name": "ArchVisCharacter",
"Enabled": false
},
{
"Name": "PluginBrowser",
"Enabled": true
}
],
"TargetPlatforms": [
"Android",
"IOS"
]
}
to this
{
"FileVersion": 3,
"EngineAssociation": "4.11",
"Category": "",
"Description": ""
}