Package appers to be invalid

i have buld an app but when installingi getan error ‘App not installed as Package appers to be invalid’ i have tried edditing packagename to several names and i still receive the same error, i have also remove extension used but error still the same. any helb

You didn’t give enough proper details to diagnose this.

Write the issue clearly and share screenshots of the exact error.
Also send your package name.

Right now you’re just guessing (changing package name, removing extensions) without identifying the real problem — that won’t fix anything.