i created a new app changed package name with custom package . then when i export my app i was unable to open the app because app dont have any package name. 
can anyone solve this issue
Welcome @rizwan213rizi to community…
Would you please elaborate your issue with some screenshots of error?
What was your custom package name? Provide an .apk to test
Additionally you have to read this
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on screen 1 under advanced properties you will find package name make sure you enter correct.
I will reject your post until you learn to write in lowercase.
Btw, that’s wrong package name, should be
com.example.appname
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it should be
com.free.forexsignals or
com.[your specified name or developer name].freeforex[app name]
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I think ,You select minimun SDK 28 and your phone might have lower version ,Try changing Min SDK to lower like 21/22 and try again
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