eNoInputFiler Error

After running the following code block, the drawing becomes unusable, as every time I run ReadDwgFile after a successful run I get "ENoInputFiler."

foreach (ObjectId attributeObjId in anotherBlkTableRecord)
                                        {
                                            AttributeDefinition attributeDefinition = (trans.GetObject(attributeObjId, OpenMode.ForRead).GetType() == typeof(AttributeDefinition) ?
                                                (AttributeDefinition)trans.GetObject(attributeObjId, OpenMode.ForRead) : null);
                                            if (attributeDefinition != null)
                                            {
                                                if (string.Compare(attributeDefinition.Prompt, attributePrompt, true) == 0)
                                                {
                                                    return GetAttributeValueStep2(activeDb, workingBlock, attributeDefinition.Tag);
                                                }
                                            }
                                        }

Am I doing something wrong?