vb.net - AES decrypt error -

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hi getting error: padding between characters invalid , cannot removed or padding invalid , cannot removed.

the code is:

public shared function decrypt(byval text string) string     dim inputbytes byte() = convert.frombase64string(text)     dim resultbytes byte() = new byte(inputbytes.length + 1) {}     dim decryptedtext string = [string].empty     dim cripto new rijndaelmanaged()      using ms new memorystream(inputbytes)         using objcryptostream new cryptostream(ms, cripto.createdecryptor(_key, _iv), cryptostreammode.read)             using sr new streamreader(objcryptostream, true)                 decryptedtext= sr.readtoend()             end using         end using     end using      return decryptedtext end function

please me


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