Streaming quotes from Interactive Brokers to Matlab demo file error

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ando am 8 Feb. 2021

When I run this Matlab 2020b demo (streaming quotes from Interactive Brokers to Matlab)

edit IBStreamingDataWorkflow.m.

I get the following error message:

Warning: Error occurred while evaluating listener callback.

Error using comeventcallback (line 24)

Error firing event 'tickString' to '@(varargin)ibExampleRealtimeEventHandler(varargin{:})'.

Otherwise, the demo appears ok. What's causing the error?

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