This problem can be seen when trying to multiple FPGA references at the same time. myRIO-1900 has a default FPGA biftile or personality that is used by the Smart Open.vi. If you need to use a custom FPGA personality, then you need to make use of the function Set Custom Bitfile.vi. This function needs to be used at the beginning of your code so the rest of the functions that require access the FPGA personality (as Smart Open.vi) can use the customized version instead of the default version.When the Set Custom Bitfile.vi is executed the new FPGA personality will be defined. In this case, defining the right execution order using the error cable will fix the issue. You can connect the output error cable of the Set Custom Bitfile.vi to the input of the Smart Open.vi as shown below.
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