widget and MMI error

[samarreynGS7edge]

Most of my widget suddenly disappear. i am running nougat 7.0 update. i am also facing invalid MMI error every time i attemp to check my balance. please help.

[imthi1]

Same problem for me also can anyone answer plz

[samarreynGS7edge]

i talked to my net provider even with the customer care service samsung but it seems no one knows how to fix it. so bad.