B4J Question B4XCipher is causing errors

Sub DecryptText(EncryptedData() As Byte, password As String) As String
    Dim c As B4XCipher
    Dim b() As Byte = c.Decrypt(EncryptedData, password)
    Return BytesToString(b, 0, b.Length, "utf8")
End Sub

B4J Version: 7.31
Java Version: 8
Parsing code. (0.00s)
Building folders structure. (0.01s)
Compiling code. (0.01s)
Compiling layouts code. (0.00s)
Organizing libraries. (0.00s)
Compiling generated Java code. Error
B4J line: 74
Dim b() As Byte = c.Decrypt(EncryptedData, passwo
javac 1.8.0_101
src\b4j\example\main.java:156: error: cannot access DataLengthException
_b = _c.Decrypt(_encrypteddata,_password);
^
class file for org.bouncycastle.crypto.DataLengthException not found
1 error

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