Shared variables can return the following error codes when the Real-Time FIFO is enabled. Refer to the KnowledgeBase for more information about correcting errors in LabVIEW.

Code Description
−1950678972 LabVIEW failed to load Logos. There may be a problem with the installation. Ensure that either the Network Variable Engine or Variable Client Support is installed.
−1950678970 Failed to load rtvarsup, which is required for Shared Variables with the Real-Time FIFO enabled.
−1950678969 Failed to load rtvarnet, which is required for Network-Published Shared Variables with the Real-Time FIFO enabled.
−1950678966 Cannot access I/O variables in Direct mode remotely. Either access the I/O variable locally, or change the access mode to Scanned.
−1950678964 Failed to load NI Scan Engine software required for I/O Variable access. If you are hosting I/O variables on an RT target, ensure that the NI Scan Engine is installed on the RT target. If you are hosting I/O variables on Windows, you must install a Windows I/O driver, such as DeviceNet, that includes NI Scan Engine support. If you are hosting I/O variables in a Windows VI, the VI must be part of an open LabVIEW project. If you are hosting I/O variables in a Windows-built application, the application must be configured to include hardware configuration.
−1950678958 This property can be called only on an I/O alias.
−1950678957 This property can be called only on an I/O variable.
−2223 The Variable Client Support software required by the shared variable is missing or of the wrong version. Ensure that you have installed the correct version of the Variable Client Support software on the RT target using MAX.
−2221 The variable RT FIFO write buffer is full. The oldest data point in the buffer will be overwritten.
−2220 The variable RT FIFO read buffer is empty. There is no available data to read.