This is a very common and easily solved error. When a structure composed of a single member is introduced, it is necessary to prevent rotation around its own axis.
If the supports have the rotation in x (Rx) released, it causes instability by rotation of the whole member. To correct this, simply define the supports as follows:
As a result, the supports are represented graphically as shown in the following figure:
And, in this way, the program obtains results without any problems:
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