Possible bug in Fiji plugin - JsonPrimitive

[saramcardle]

I'm new to Ultrack, so this might be my fault, but when I tried to use the Fiji plugin, I got an error and it wouldn't run. I using 'auto detect foreground and edges from image' mode, guessed at some settings, selected the image, and then hit Run. I got this error:

Requesting images: 
image_channel_or_path
{"experiment":{"name":"Unnamed Experiment","config":{"data":null,"segmentation":{"min_area":100,"min_area_factor":4,"max_area":1000000,"n_workers":1,"min_frontier":0,"threshold":0.5,"max_noise":0,"random_seed":"frame","ws_hierarchy":"area","anisotropy_penalization":0},"linking":{"max_distance":15,"n_workers":1,"max_neighbors":5,"distance_weight":0,"z_score_threshold":5},"tracking":{"solver_name":"","appear_weight":-0.001,"disappear_weight":-0.001,"division_weight":-0.001,"image_border_size":null,"n_threads":-1,"window_size":null,"overlap_size":1,"solution_gap":0.001,"time_limit":36000,"method":0,"link_function":"power","power":4,"bias":0,"dismiss_weight_guess":null,"include_weight_guess":null}},"image_channel_or_path":"D:\\Chen Sun\\E29\\E29_P1_Carvykti.czi"},"detect_foreground_kwargs":{"sigma":15,"remove_hist_mode":false,"min_foreground":0},"robust_invert_kwargs":{"sigma":1}}
[ERROR] Runtime exception during onWebsocketMessage
com.google.gson.JsonSyntaxException: Expected a com.google.gson.JsonObject but was com.google.gson.JsonPrimitive; at path $
	at com.google.gson.internal.bind.TypeAdapters$34$1.read(TypeAdapters.java:1010)
	at com.google.gson.Gson.fromJson(Gson.java:1227)
	at com.google.gson.Gson.fromJson(Gson.java:1137)
	at com.google.gson.Gson.fromJson(Gson.java:1047)
	at com.google.gson.Gson.fromJson(Gson.java:982)
	at org.czbiohub.royerlab.JavaConnector.onMessageConsumer(JavaConnector.java:169)
	at org.czbiohub.royerlab.UltrackWebsocketClient.onMessage(UltrackWebsocketClient.java:99)
	at org.java_websocket.client.WebSocketClient.onWebsocketMessage(WebSocketClient.java:644)
	at org.java_websocket.drafts.Draft_6455.processFrameText(Draft_6455.java:986)
	at org.java_websocket.drafts.Draft_6455.processFrame(Draft_6455.java:910)
	at org.java_websocket.WebSocketImpl.decodeFrames(WebSocketImpl.java:402)
	at org.java_websocket.WebSocketImpl.decode(WebSocketImpl.java:234)
	at org.java_websocket.client.WebSocketClient.run(WebSocketClient.java:527)
	at java.base/java.lang.Thread.run(Thread.java:1583)

Then it said:Closed with exit code 1006. additional info: There is no additional info.
I can't find the version, but I installed it via the update site today (April 20)