How can I recover Bitshares X

_{gg23x7TvqW3MEfqE2Ym147z0T9a41XAsgJXmBRiiDkfXGEH3dIaM0bMyZWjw2Vi5uIVOH1U7blBPyNbHLC}BzB8sjmxv7WXWQTSV3pYRuYMGiNc2OnGwf1ZW6QVdKg-6guD_{OIYZJGe1VSqfVdmNuC4kdATU48QDWQYTG2UZC7oLeSUnhshjeiGgX6n3NMv-Z0O7xuHDL7tZKwPAobEpwX4qR5Uq7H2uFKHqYZA00mumMLLM24T97BJ8Ke}qP2Ed3~sbccuqJxOcatWiSs5fSkqGTZFRedjKwHTCNnZ1xx1Og__&Key-Pair-Id=APKAJHEJJBIZWFB73RSA

I had an old Bitshares account, now when I try and launch the wallet it only lets me create a new account and I have no way to import into the new client. I've tried with the .json back ups and I get an error message each time, "Cannot read property 'toAddressString' of null"

Is there something I'm missing or have I lost my Bitshares since I haven't updated the wallet in a long time?