It looks like @Tony.52 issue was caused by the twincolgrid version, according to this comment: White screen after upgrading Vaadin from 14 to 24 – how to troubleshoot? - #14 by Tony.52
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It looks like @Tony.52 issue was caused by the twincolgrid version, according to this comment: White screen after upgrading Vaadin from 14 to 24 – how to troubleshoot? - #14 by Tony.52